FOMO2021

  • Job Opportunities (Archived),  PhD Opportunities (Archived)

    PhD Studentships in Quantum Matterwave Optics (nanoLace)

    The PhD students will perform their research at IESL-FORTH and be enrolled in the University of Crete. They will receive training from the experienced matterwave group at IESL. At the start they attend one or two dedicated summer schools (Les Houches, FOMO etc) and later on attend one or two international conference per year. Additional skills training (IPR, language etc.). Optional internships in other research groups and major high-tech companies are possible. The salary ranges between 850EU and 1200EU net, depending e.g. on country of origin.

  • Job Opportunities (Archived),  Postdoc Opportunities (Archived)

    CALL FOR GEORG H. ENDRESS POSTDOC FELLOWS

    Basel-Freiburg Center for Quantum Science and Quantum Computing QSC EUCOR – The European Campus The Center for Quantum Science and Quantum Computing (QSC) of the Universities of Basel (Switzerland) and Freiburg (Germany), embedded in EUCOR – The European Campus, invites applications for up to six Georg H. Endress Postdoc Fellowships to start in 2022. The Center seeks to attract outstanding young talents to engage in cutting-edge projects involving the research groups present at Basel and Freiburg. The ideal Georg H. Endress Fellow has just finished a PhD in experimental or theoretical physics (or related areas), is of the highest caliber of intellectual achievement, and is eager to shape the academic environment in research and teaching…

  • Job Opportunities (Archived),  PhD Opportunities (Archived),  Postdoc Opportunities (Archived)

    Postdoctoral and PhD positions available on Cold Atom Quantum Sensors for Onboard Applications

    Location: Institut d’Optique d’Aquitaine, Talence (Bordeaux area, France)  A unique environment for quantum technologies, combining cutting-edge academic research and application-oriented industrial R&D and gathering key players in the field:  LP2N: Academic research lab, specialized in novel atom interferometry techniques iXblue: Industrial company, pioneer in field quantum sensors iXatom: fully integrated joint research lab between LP2N and iXblue  Naquidis: Innovation center for quantum technologies  Many possible projects, ranging from fundamental physics to field applications:  – High flux ultracold atom sources for the next generation of quantum sensors– Miniaturization of multi-axis quantum accelerometer using hybrid atom chips – Multidimensional atom interferometry towards full quantum inertial navigation units – Quantum sensors for Space geodesy – Quantum sensors in microgravity and applications…

  • Job Opportunities (Archived),  PhD Opportunities (Archived),  Postdoc Opportunities (Archived)

    IQ-Hannover: PhD and Postdoc Positions in Artificial Intelligence applied to Atom Interferometry

    Applications are invited for two PhDs and for a post-doctoral research position at the Institute of Quantum Optics, Leibniz University of Hanover, Germany. The positions are available to be filled immediately until the end of 2024 with funding provided by the German Aerospace Agency (DLR).

  • Job Opportunities (Archived),  PhD Opportunities (Archived)

    Master and PhD Studentships at the Vienna Quantum Nanophysics Group

    We want you in our team ! If you find yourself in the following list of qualifications, you may want to consider applying for one of the Master or PhD topics listed below.  You are driven by curiosity, the desire to learn and the ambition to explore the unknown ? You love working on experiments at the forefront of research ? You have an experimental background in quantum physics, molecular beam science or physical chemistry. You have a good theory background and you are proud of your study records ? You feel at ease in an interdisciplinary and international team ? You are ambitious and embrace a spirit of collaborative and supportive competitiveness ? …

  • Job Opportunities (Archived),  PhD Opportunities (Archived)

    2 PhD Studentships in Quantum Matterwave Optics (nanoLace)

    The PhD students will perform their research at IESL-FORTH and be enrolled in the University of Crete. They will receive training from the experienced matterwave group at IESL. At the start they attend one or two dedicated summer schools (Les Houches, FOMO etc) and later on attend one or two international conference per year. Additional skills training (IPR, language etc.). Optional internships in other research groups and major high-tech companies are possible. The salary ranges between 850EU and 1200EU net, depending e.g. on country of origin.

  • Postdoc Opportunities (Archived)

    PostDoc in Quantum Matterwave Optics on Crete (nanoLace)

    The Project Recent advances in our ability to generate and manipulate quantum-coherent matterwaves is now ushering in a new era of quantum optics, where the roles of matter and light are almost exactly reversed. We are starting to be able to create almost arbitrary matterwave-images, (de)magnify, and project them. We have recently even been able to demonstrate a coherent waveguide for matterwaves (published in Nature). We have recently demonstrated the first matterwave lenses inside matterwave guides. Waveguided Matterwave mirrors and cavities have become reality.   In the nanoLace project, we are going to build a novel type of matterwave lithography experiment, where we will exploit the fact that time-dependent matterwave lenses…

  • Job Opportunities (Archived),  PhD Opportunities (Archived)

    SISSA-ICTP-TII Ph.D POSITIONS

    In the framework of the agreement signed the International School for Advanced Studies(SISSA), the International Centre for Theoretical Physics (Trieste), and Technology Innovation Institute (Abu Dhabi), we announces a selection based on academic qualifications and aninterview for the conferment of three PhD fellowships on Physics andalgorithms for Quantum Technology starting from the academic year 2021/22.  + PhD course in Theory and Numerical Simulation of Condensed Matter 2fellowships+ PhD course in Statistical Physics 1 fellowshipCandidates can participate to the selection for one or both coursesDuration of the programme: 4 yearsSubmission Deadlines for Applications: 06/09/2021 – 13:00 Links:https://www.sissa.it/bandi/selection-conferment-three-phd-fellowships-%E…https://www.sissa.it/system/files/bandi/Call%20TII-QRC-Eng.pdf

  • Postdoc Opportunities (Archived)

    Research Assistant (PhD, m/f/d) in the field of Experimental Physics

    (Salary Scale 13 TV-L, 75 %) In course of the CRC TerraQ, the Institute of Quantum Optics invites applications for the position of a Research Assistant (PhD, m/f/d) in the field of Experimental Physics (Salary Scale 13 TV-L, 75 %) starting as soon as possible. The position is initially limited to 3 years. Responsibilities and duties The “Very Long Baseline Atom Interferometer“ facility (VLBAI) is one of three major research instruments at the “Hannover Institut für Technologie“ (HITec). Spanning across 10m free fall distance, our apparatus allows one to perform atom interferometry with rubidium and ytterbium with very large scale factors. In combination with exquisite control over systematic effects, e.g.…

  • PhD Opportunities (Archived)

    PhD Position: ULTRACOLD 1D FERMI GASES at the ENS Paris

    A 3 year PhD scholarship and a 2 year postdoc position are open at LKB ENS on the physics of 1D Fermi gases. Quantum physics in lower dimension is strikingly different from its 3D counterparts, and many paradigms governing three-dimensional phenomena fail when the dynamics of particles is confined in one or two dimensions. A celebrated example is the breakdown of Landau’s Fermi liquid model in 1D: while thermodynamical and transport properties of 3D interacting fermionic systems can be captured by assuming that they behave as an ensemble of weakly interacting quasi-particles, the low-lying excitations of one-dimensional systems are governed by collective excitations where density and spin degrees of freedom…

  • Postdoc Opportunities (Archived)

    Postdoctoral Fellow in Theoretical and Computational Physics

    We have an opening for a 2-year fixed-term research position in analytical and computational quantum dynamics of ultracold atoms. Applications are invited for a postdoctoral fellowship in theoretical and computational physics of ultracold few-atom systems. The postdoctoral fellow will work on fundamental aspects of quantum dynamics, semiclassical quantum chaos, and stochastic computational methods applied to strongly correlated ultra-cold atom systems with short-range interactions. A further aspect of the project is the development and implementation of stochastic algorithms for quantum dynamics and excitation spectra of closed and open quantum systems, extending the existing projector quantum Monte Carlo algorithms in the software package Rimu.jl (https://github.com/joachimbrand/Rimu.jl). The main research question is how few-body quantum correlations can…

  • PhD Opportunities (Archived)

    PhD Position in Guided Matterwave Interferometry

    Background: In matterwave interferometry, atoms are put into a superposition of two different momentum states. They are then made to travel in two different paths (yes, during part of the interferometry sequence every individual atom is at two distinct places at the same time) before being recombined. Depending on the phase accumulated in the two different paths the atoms end up in two different distinguishable states. The accumulated phase is extremely sensitive to minute entry differences between the two paths travelled, making ultra-sensitive measurements of gravitation, acceleration, or rotation possible. Atoms, however, have the tendency to fall under the influence of earth’s gravitation. This means, that in order to measure at…

  • Postdoc Opportunities (Archived)

    Research Fellow in Cold Atom Gradiometry

    https://tinyurl.com/ztnhxs95 Atom interferometry has become a versatile tool for fundamental research and, more recently, has started to move out of the laboratory towards quantum sensing for a wide range of applications. The atom interferometry group at the University of Birmingham is focused on the development of sensors for the measurement of gravity and gravity gradiometry. The group is now seeking candidates to play a key role in the developing the next generation of compact cold atom gravity gradiometers. The aim is to create portable devices that can operate on moving vehicles. Within this position, the successful candidates will develop the cold atom gravity gradiometer, the requisite underpinning hardware and perform research…

  • Postdoc Opportunities (Archived)

    Research Fellow on the AION Project

    See https://tinyurl.com/m96zxm4v Atom interferometry has become a versatile tool for fundamental research and, more recently, has started to move out of the laboratory towards quantum sensing for a wide range of applications. The atom interferometry group at the University of Birmingham is focused on the development of sensors for the measurement of gravity and gravity gradiometry. The group is now seeking candidates to fulfil a key role in the development of a new strontium atom interferometry laboratory for research into techniques to improve large momentum transfer and enable improvements in sensitivity. This is part of the recently funded Atom Interferometry Observatory and Network project (AION), funded within the Quantum Technologies for…

  • FOMO2021 Lecturers,  Oliver Buchmueller

    Oliver Buchmueller

    Oliver Buchmueller is a scientist and professor of physics at the Faculty of Natural Science, Imperial College London. Buchmueller is presently serving as one of the lead scientists on the CMS experiment at CERN’s LHC, the Principal Investigator of the Atom Interferometer Observatory and Network (AION) and also one of the lead authors at Atomic Experiment for Dark Matter and Gravity Exploration in Space (AEDGE). Previously he has been associated with ALPEH experiment at CERN’s LEP collider and the BaBar experiment at SLAC.

  • FOMO2021 Abstracts

    Simulation of wavefront propagation for a cold atoms gravimeter (Pesche, Maxime)

    A cold atoms gravimeter il a device which measure the gravity with Raman transitions on free falling atoms. Since 2006, the SYRTE research team is working on such a gravimeter, and during my thesis, I will continue their work. Today, this gravimeter is working with an accuracy of 5.7 10^-8. The limits on this result are known: the wavefront aberration. The combination of the velocity distribution of the atoms and the irregularity of the optics create a complicated to evaluate bias on g which fluctuate in time. This cause a degradation of the accuracy and the long term stability. In this talk, I will present the work I did during…

  • Postdoc Opportunities (Archived)

    Postdoctoral position in experimental quantum optics in Budapest

    The Project — The Quantum Optics Group of the Wigner Research Centre for Physics in Budapest is looking for a motivated postdoctoral fellow to perform experimental  research in the frame of the Quantum Information National Laboratory of Hungary. The aim of the project is the realisation of an atom based quantum interface to coherently couple low-intensity microwave and optical signals. The postdoctoral fellow will be involved in the development of the cavity quantum electrodynamics experiment to trap ultracold atoms and realise an optical lattice within a high-finesse optical resonator. The Host — The Quantum Optics group, led by Prof. Peter Domokos, has both experimental and theoretical activities in the research field of cavity QED with cold atoms…

  • Lisa Wörner (Speaker at FOMO2021)
    FOMO2021 Lecturers,  Lisa Wörner

    Lisa Wörner (Speaker at FOMO2021)

    Lisa Wörner works at the ZARM – Center for Applied Space Technology and Microgravity, University of Bremen in the Space Technology Group. is a researcher with interests in different quantum mechanical areas. Her main focus is BECCAL (Bose Einstein Condensate and Cold Atom Laboratory), a joint mission between NASA and DLR to investigate atom optics under microgravity. In this capacity she is striving to advance fundamental quantum physics research in space as well as developing new technologies. This includes the preparation of experiments for extreme environments, tackling open challenges, finding novel solutions, and the ruggedization and miniaturization of setups. In addition to the research on cold and condensed atoms, she is involved in development of optical clocks and quantum repeaters for space based applications.…

  • FOMO2021 Lecturers,  Philippe Bouyer

    Philippe Bouyer (Speaker at FOMO2021)

    Philippe Bouyer is research director at CNRS and deputy director of the Institut d’Optique Graduate School in Bordeaux. He received his doctorate at Ecole Normale Supérieure in 1995. Since then, he has been worked on atom interferometer-based inertial sensor experiments, atom lasers and Anderson localization with cold atoms. His current interests are the study of quantum simulators with ultracold atoms and the development of atom interferometers for testing general relativity in space or detecting gravity fields and gravitational waves underground. He is the recipient of the 2012 Louis D award of the French academy, APS fellow and OSA senior member.

  • FOMO2021 Abstracts,  FOMO2021 Presentations

    Weak values in the study of quantum correlations (Zamora, Santiago)

    (Physics Institute, UNAM) Abstract Weak values have become of interest in recent years due to their several applications and their succesful experimental realization. Among their applications, they are useful in the theoretical detection of quantum correlations. In this talk I will present the general idea of what is a weak value and a quantum entanglement criterion for a system of 2 particles in a pure state using the weak values formalism. Slides

  • FOMO2021 Lecturers,  Mark Baker

    Mark Baker (Speaker at FOMO2021)

    Mark Baker is a researcher in Quantum Technologies with DSTG (Defence Science and Technology Group), Australia. He is also Research Fellow & Honorary Senior Fellow at the School of Mathematics and Physics of the The University of Queensland.

  • FOMO2021 Lecturers,  Michael Holynski

    Michael Holynski (Speaker at FOMO2021)

    Michael Holynski is a Senior Lecturer in the Cold Atoms research group, part of the Midlands Ultracold Atom Research Centre, and the UK National Quantum Technology Hub in Sensors and Metrology. He leads the Atom Interferometry group, where he focuses on gravity gradient sensors and their use within applications. This includes developing gradiometers for use in the field and pushing to create more compact and deployable devices, while also investigating approaches to improve their sensitivity. Michael is active in enabling the translation and commercialisation of quantum technology, and leads a portfolio of collaborative projects with industry ranging from component development to system level realisation of industrial sensor prototypes and engagement…

  • FOMO2021 Lecturers,  Stephanie Manz

    Stephanie Manz (Speaker at FOMO2021)

    Stephanie Manz is University Assistant at TU Wien. Her main research interests are quantum metrologyand matter-wave optics with cold atoms and electrons, with a current focus on cold atoms and interferometry with trapped Bose-Einstein condensates. With a small team, she is developing a trapped Cesium interferometer with tunable interactions.

  • FOMO2021 Lecturers,  Onur Hosten

    Onur Hosten (Speaker at FOMO2021)

    Onur Hosten is head of the Quantum Sensing with Atoms and Light Group at the Institute of Science and Technology Austria (IST Austria). He received his PhD from the University of Illinois at Urbana-Champaign and then worked as a postdoc and Research Associate at Stanford University, Palo Alto. His group aims to develop innovative techniques to control quantum properties of atomic and optical systems with an eye towards applications in the domain of precision sensing. By manipulating the collective properties of cold atomic ensembles in optical cavities, the group intends to build precision sensors of time, force, acceleration, and in the process gain more insight into foundational aspects of quantum mechanics. The current focus is developing…

  • Luca Pezzé (Speaker at FOMO2021)
    FOMO2021 Lecturers,  FOMO2022 Lecturers,  Luca Pezze

    Luca Pezzé

    Luca Pezzé is at QSTAR – Quantum Science and Technology in Arcetri of the Istituto Nazionale di Ottica, CNR-INO at LENS. His research activity focuses on the theory of quantum-enhanced interferometry, entanglement and quantum gases.

  • FOMO2021 Abstracts

    Brimis, Apostolos — Tornado waves

    Structured light has recently attracted the interest of scientific society while it is possible to control it in all its degrees of freedom and dimensions. I will present light spiraling like a tornado over its propagation. Such structured light can be generated by superimposing abruptly auto- focusing ring-Airy beams that carry orbital angular momentum of opposite handedness. This results to a complex wave with intense lobes that twist and shrink in an accelerating fashion along propagation. [1] A. Brimis, K. G. Makris, and D. G. Papazoglou, “Tornado waves,” Opt. Lett.45, 280–283 (2020). [2] Dimitris Mansour, Apostolos Brimis, Konstantinos G. Makris and Dimitris G. Papazoglou, "Generating Spiraling Light: Optical Tornados "…

  • FOMO2021 Abstracts

    Simonsen, Veronica P. — The NanoLace project: Grid-based holograms for matter waves lithography

    Grid-based binary holography (GBH) is an attractive method for patterning with light or matter waves. It is an approximate technique in which different holographic masks can be used to produce similar patterns. Mask-based pat- tern generation is a critical and costly step in microchip production. The next- generation extreme ultraviolet- (EUV) lithography instruments with a wave- length of 13.5 nm are currently under development. In principle, this should allow patterning down to a resolution of a few nanometers in a single expo- sure. However, lithography with metastable atoms has been suggested as a cost-effective, less-complex alternative to EUV lithography. The great advan- tage of atom lithography is that the kinetic…

  • Augusto Smerzi (Speaker at FOMO2021)
    Augusto Smerzi,  FOMO2021 Conference Speakers,  FOMO2021 Lecturers

    Augusto Smerzi

    Augustois Director of Research at the  Istituto Nazionale di Ottica, CNR-INO  and head of the Theory of Quantum Information Group. at the  QSTAR – Quantum Science and Technology in Arcetri. His research interests mainly focus on the theory of quantum enhanced interferometry, the dynamics of ultra cold gases andthe foundations of quantum mechanics.  

  • FOMO2021 Abstracts,  FOMO2021 Presentations

    Sinkevičienė, Mažena Mackoit — Quantum metrology: from solids to cold atoms

    k I will touch two directions of my research: color centers in solids that I have investigated during my PhD studies and cold atom systems that I am going to investigate during my Postdoc. First, I will present my studies of solid-state systems capable of emitting non-classical states of light. Subsequently I will briefly describe the idea of creating the non-classical spin states and spin squeezing for the cold fermionic atoms in optical lattices by applying the spin-orbit coupling and the periodic driving of the system.

  • FOMO2021 Abstracts

    Faraji, Elham — Properties of electronic currents along DNA fragments through light pumping

    We are working on a model partly borrowed from the standard Davydov-Fröhlich models originally introduced to account for electron-phonon interaction in macromolecules. Under the action of an external electromagnetic field on a DNA protein, the energy transferred to the electron shows an electronic current which can display either a spreading frequency spectrum or a sharply narrow frequency spectrum. This phenomenology displays a potentially rich variety of electrodynamic interactions of DNA molecules by the electron excitation. This could imply the activation of interactions between DNA and external electromagnetic fields.

  • FOMO2021 Abstracts

    Li, Vyacheslav — Frequency offset locking

    Applications of lasers in quantum metrology require precise control of the laser frequency. This is usually achieved by locking the frequency of a slave laser at a tunable offset from a master laser. Here we present a new scheme for a robust and high precision laser offset frequency locking. A hybrid frequency discriminator generates an error signal that has a wide capture range of more than 180 MHz while preserving sharp resonance needed for a tight lock. The Allan deviation was measured to be less than 12 Hz at 1 seconds and remained below 1 kHz for more than 1000 seconds.

  • FOMO2021 Abstracts

    Wilson, Gwyn — Resonant Transmission in Smooth Barriers

    Resonant transmission is a well-known effect in quantum mechanics, often studied in undergraduate physics courses. There is a resonant behaviour in the transmission probability for a square barrier potential. However, this effect is not seen in a gaussian barrier. The lack of resonances is investigated for barriers that start with a square shape and are deformed into a smoother one, with the transmission probability being calculated numerically. Doing so gives insight into the behaviour of the resonances and how the barrier shape can affect their presence.

  • FOMO2021 Abstracts

    Kristensen, Sofus Laguna — Properties of Raman beamsplitters using phase modulated light in an optical cavity

    Using an optical cavity to perform atom interferometry offers several advan- tages; the high-quality wavefronts allows for very long coherence time (20 s) of a spatially seperated superposition held in an optical lattice, and the resonant power enhancement allows the use of simpler laser systems with a fiber opti- cal modulator to generate laser frequency pairs that are needed for performing Raman beamsplitters. However, these frequency components form multiple standing waves in the cavity, resulting in a periodic spatial variation of the properties of the atom-light interaction along the cavity axis. Here, we will describe this spatial dependence and calculate two-photon Rabi frequencies and ac Stark shifts, and confront the…

  • FOMO2021 Abstracts

    Ben Aicha, Yosri — Bragg-Based Atom Interferometry with Overlapped Spatial Fringes

    Bragg-based atom interferometry is the standard technique for atom interferometry using Bose-Einstein condensates as an atomic source. However, as it is unable to distinguish between the two output ports of the interferometer at the final beam splitter pulse, a minimum separation time between the two clouds is required. This reduces the interferometer time compared to Raman methods for a given device size. We present a measurement technique to reduce this separation time by monitoring the phase between a spatial reference and overlapped spatial fringes arising from an asymmetrical Mach-Zehnder interferometer.

  • FOMO2021 Abstracts

    He, Yuanlei — Multifrequency Slower for MOT

    This project will give an approach to using multiple frequencies of light to enhance the loading of a Magneto-Optical Trap (MOT). An electro-optical modulator will be used to produce frequency and intensity tunable sidebands, enabling the nature of slowing to be controlled, and thus optimized, by the user. There are some basic computational simulations that have been done so far. The motivation for this project and some basic ideas will be introduced in this presentation.

  • FOMO2021 Abstracts

    Favalli, Tommaso — Time from Quantum Entanglement

    The idea that time may emerge from quantum entanglement originated from a mechanism proposed in 1983 by Don Page and William Wootters to solve the, so called, “problem of time” that arises in the context of canonical quantization of gravity. The Page and Wootter (PaW) theory consists in dividing the total Hilbert space into two sub-systems and assigning one of it to time. The “flow of time” then consists simply in the entanglement between the quantum degree of freedom of time and the rest of the system, a correlation present in a global, time-independent state. In this framework we do not consider time as an abstract, external coordinate, but as…

  • FOMO2021 Abstracts

    Ruhl, Joanna — Lagrange bracket approach to quantum fluctuations in macroscopic parameters of NLS breathers

    In the focusing nonlinear Schrodinger equation, multisoliton ”breathers” may be created from a single mother soliton by quenching the strength of the nonlinear interaction. In ultracold-gas realizations, atop the mother soliton there are quantum fluctuations coming from its underlying quantum many-body nature, computable from the Bogoliubov theory. Post-quench, these fluctu- ations become the fluctuations in the macroscopic parameters of the daughters, which exist in a coherent macroscopic quantum state. We present a mean-field formalism that uses Lagrange brack- ets to compute, from given pre-quench fluctuations, the fluctuations of the macroscopic parameters of the daughter solitons, with results for both the 2-soliton and 3-soliton breathers.

  • FOMO2021 Abstracts

    de Almeida, Alexandre A. C. — Generation of correlated forward four-wave mixing signals with cold atoms

    We report preliminary results on the generation of two correlated Forward Four-Wave Mixing (FFWM) signals using cold rubidium atoms. To induce the FFWM process, we use two almost copropagating beams, with linear and orthogonal polarization. We calculate the time-delay intensity correlation function between all four fields to detect correlation and anticorrelation. In addition, the spectral lineshape of the FFWM signals presents an interesting feature. If one scans the frequency of both input beams simultaneously, the spectra will present a dip around the resonance due to the coherent population trapping. We use a simple three-level lambda system and solve the Bloch equations to model this feature.

  • FOMO2021

    Richaud, Andrea — Vortices with massive cores in a binary mixture of BECs

    We analyze a notable class of states relevant to an immiscible bosonic binary mixture loaded in a rotating boxlike circular trap, i.e., states where vortices in one species host the atoms of the other species, which thus play the role of massive cores. The resulting effective Lagrangian resembles that of charged particles in a static electromagnetic field, where the canonical momentum includes an electromagnetic term. The simplest example is a single-vortex system. While a massless vortex can only precess uniformly, the presence of a sufficiently large filled vortex core renders such precession unstable. A small core mass can also enhance the orbit radius or lead to small radial oscillations, which…

  • FOMO2021 Abstracts

    Richaud, Andrea — Vortices with massive cores in a binary mixture of BECs

    We analyze a notable class of states relevant to an immiscible bosonic binary mixture loaded in a rotating boxlike circular trap, i.e., states where vortices in one species host the atoms of the other species, which thus play the role of massive cores. The resulting effective Lagrangian resembles that of charged particles in a static electromagnetic field, where the canonical momentum includes an electromagnetic term. The simplest example is a single-vortex system. While a massless vortex can only precess uniformly, the presence of a sufficiently large filled vortex core renders such precession unstable. A small core mass can also enhance the orbit radius or lead to small radial oscillations, which…

  • FOMO2021 Abstracts

    Safeer, S S — Design and development of Electronics modules for a Compact Cold Atom Inertial System

    Research aim is to develop a compact electronics module for a cold atom interferometer based system using Rubidium atoms (780nm). Laser systems are one of the most critical part of the cold atom system as they have to be stable in terms of optical power, frequency, line width and spectral properties and should also be a compact system. It is also required to control modulator drivers, RF drivers and detection systems by suitably pulsing the devices as per the requirement of the measurement system. In laboratory-based set ups, these devices are accommodated in multiple electronics racks and transportation of the systems will be a bit difficult. Hence, it is proposed…

  • FOMO2021 Abstracts

    Famà, Francesca — Towards continuous superradiance with a hot atomic beam

    Continuous superradiant lasers have been proposed as next generation optical atomic clocks for precision measurement, metrology, quantum sensing and the exploration of new physics [1]. Superradiance is a collective phenomenon resulting in an enhanced single atom emission rate [2]. A way to provide the required phase synchronization is coupling a cold cloud of atoms to a cavity mode. This technique has been used to demonstrate pulsed superradiance [3-5], however, steady-state operation remains an open challenge. Here we describe our machine aimed at validating an alternative proposal [6], a rugged superradiant laser operating on the 1S0-3P1 transition of 88Sr using a hot collimated atomic beam. The elegance of this approach is…

  • FOMO2021 Abstracts

    Hanımeli, Ekim T. — Combining Bragg and Raman processes for novel interferometry topologies

    Bragg and Raman are the two most important techniques to form beam splitters in atom interferometry. While often used for the same purpose, the two techniques have different physical characteristics that can be exploited in different ways. This allows two methods to be combined to create interesting novel interferometry topologies, such as quantum clock interferometry. In this presentation I will talk about some of the possibilities that utilize a combination of Bragg and Raman transitions, and the new laser system built for Quantus-1 that is able to implement both processes.

  • FOMO2021 Abstracts

    de Almeida, Ricardo Costa — Entanglement certification of many-body systems with quench dynamics

    Entanglement is central to the modern understanding of quantum systems and the primary resource for upcoming quantum technologies. However, a potential bottleneck for future advances is the need for scalable protocols to detect and characterize entanglement. In particular, there is an increasing demand for procedures that can certify the presence of entanglement in quantum many-body systems. The quantum Fisher information(QFI) is a witness for multipartite entanglement of great relevance to quantum metrology. Unfortunately, it is hard to estimate the QFI so its use as a tool for entanglement certification is limited, for now. In this talk, we discuss recent works that address this issue and demonstrate that the QFI can…

  • FOMO2021 Abstracts

    Junca, Joseph — The MIGA project: measuring gravity strain with atom interferometry

    The MIGA project aims at using atom interferometry as a tool to study geophysical signals and demonstrate the applicability of quantum sensors to build a large scale instrument able to conduct high sensitivity gravity strain measurements. Currently under construction at the LSBB (low noise underground laboratory) in Rustrel in southern France, MIGA will comprise 3 atom sources connected by a common laser link for a total length of 150 m buried 300 m underground. I will present the instrument and its status of construction and a preliminary setup that enables us to study and fine tune the head responsible for producing the atoms samples at the core of the experiment.

  • FOMO2021 Abstracts

    Lezeik, Ali — VLBAI : Testing Fundamental Physics

    The universality of free fall or Einstein's equivalence principle (EEP) remains valid despite attempts to find deviations away from it. It is expected through certain theories, that quantum mechanics and general relativity can be reconciled, breaking EEP. The VLBAI presents a state-of-the-art experiment to push the current limits using matter-wave interferometry. Dropping atoms through a 10-m Mach-Zehnder type interferometer, the VLBAI attempts to measure the gravitational time dilation of the delocalized quantum superpositions induced throughout the flight time. This will further push investigations of the EEP into the quantum regime.

  • FOMO2021 Abstracts

    Boegel, Patrick — Atom interferometry aboard the International Space Station

    Atom interferometers based on Bose-Einstein condensates are expected to be exquisite systems for quantum sensing applications like Earth observation, relativistic geodesy, and tests of fundamental physical concepts. Since the sensitivity of most atomic sensors scales quadratically with the interrogation time, it is beneficial to extend the free fall time by working in a microgravity environment. We report here on a series of experiments performed with NASA's Cold Atom Lab aboard the International Space Station demonstrating first atom interferometers in orbit. By employing Mach-Zehnder-type geometries we have realized atomic magnetogradiometers and successfully compared their outcome to complementary non-interferometric measurements. Current experimental limitations as well as future perspectives will be discussed. These…

  • FOMO2021 Abstracts,  FOMO2021 Presentations

    Semakin, Aleksei — Experiments with ultra-low atomic hydrogen

    We designed and constructed of a large magnetic trap for storage and cooling of atomic hydrogen operating in the vacuum space of the dilution refrigerator at temperature of 1.5 K. Aiming on a largest volume of the trap we implemented octupole configuration of linear currents (Ioffe bars) for radial confinement, combined with two axial pinch solenoids and a 3.5 T solenoid for cryogenic H dissociator. The octupole magnet is built from 8 race-track coils - segments which are compressed towards each other with magnetic forces. This provides a mechanically stable and robust construction with a possibility of replacement/repair of each segment. The trap is thermally linked to the 1 K…

  • FOMO2021 Abstracts

    Odelli, Manuel — Design of High Fidelity Quantum Waveguides via Shortcuts To Adiabaticity

    Quantum waveguides are one of the key components in the development of quantum technologies as they are crucial in the transmission of information. The progressive miniaturization of quantum chips requires the waveguides to follow certain paths and so they need to be bent in order to be accommodate onto the chip. Often, waveguides are formed by two straight ends connected by a curved section. While the circular shape is the simplest choice, it generates wave reflection and in turn data loss. It is hence vital to find a protocol that helps designing the geometry of the curved section to ensure high transmission rates. In this work [2] we implemented a…

  • FOMO2021 Abstracts

    Malitesta, Marco — Distributed Quantum Sensing with Squeezed-Vacuum Light in a Configurable Network of Mach-Zehnder Interferometers

    Mach-Zehnder interferometry using squeezed-vacuum light is an archetype of quantum-enhanced single-phase sensing. Here we propose and study a direct generalization for the estimation of an arbitrary number of phase shifts in d ≥ 1 distributed Mach-Zehnder interferometers (MZIs). In this case, the squeezed-vacuum is split between the d modes of a linear (splitting) network, each output of the network being one sensing mode of a MZI, the other input being a coherent state. We predict i) the linear combination of phase shifts that can be estimated with optimal sensitivity, given a specific splitting network; and ii) the splitting network that allows the estimation of a specific linear combination of phase…

  • FOMO2021 Abstracts

    Bernard, Jeanne — Progress towards the development of a cold-atom inertial measurement unit for onboard applications

    Cold atom interferometers (AIs) have proven to be extremely sensitive and accurate inertial sensors measuring gravity [1], gravity gradients [2] and rotations [3]. Unlike classical sensors, they do not require any calibration and exhibit an inherent long-term stability and accuracy : they are promising candidates for geodesy, geophysics or inertial navigation. We present our progress towards the development of a cold-atom inertial measurement unit, a device measuring each component of acceleration and rotation. We demonstrate two techniques allowing to perform acceleration measurements using a Mach-Zehnder type AI in a single diffraction regime, even for atoms with close to zero velocity. The first technique lifts the degeneracy between the two Raman…

  • FOMO2021 Abstracts

    Tennstedt, Benjamin — High-rate navigation with atom interferometers

    Atom Interferometers as inertial sensors were getting quite some interest in the last decade. The superior sensitivity of the sensors is mostly reached by large interrogation times of the atoms. For high-rate navigation scenarios, however, the long measurement intervals and preparation times of the atoms lead to severe systematic errors in the navigation solution. In this contribution a quite promising combination of the atom interferometer and a classical inertial measurement unit (IMU) in an error state extended Kalman Filter framework is presented. This approach aims especially on improving the performance of the conventional IMU, while the drawbacks of the quantum sensor are negated.

  • FOMO2021 Abstracts

    Meyer, Bernd — Transfering entanglement from spin to momentum space

    Entanglement has been generated in different atomic systems to improve the sensitivity of phase estimation measurements [1, 2]. However, it is challenging to make use of this entanglement in inertially sensitive atom interferometers. One approach is to generate the entanglement directly in momentum space using nonlinear interactions in Bose-Einstein condensates [3, 4]. In our approach, we first create highly entangled states in spin states and then transfer this entanglement to momentum states. This technique generates entanglement in wellseparated momentum modes and is therefore an appropriate candidate for future entanglement-enhanced quantum sensors [5]. [1] L. Pezz`e, A. Smerzi, M. K. Oberthaler, R. Schmied, and P. Treutlein, Quantum metrology with nonclassical states…

  • FOMO2021 Abstracts

    Schach, Patrik — Tunneling-based gravimetry with matter-waves

    The measurement of the gravitational acceleration through light-pulse atom interferometers is a current topic for matter-wave based inertial sensing. Such interferometers have been developted in analogy to optical Mach-Zehnder interferometers, where beam splitters and mirrors are realized by diffracting light pulses. In this contribution, we will present two types of tunneling-based gravimeters: The first one resembles an optical Fabry-Pérot interferometer. The matter-wave cavity is described by two Gaussian barriers, so that reflection and transmission are determined by the tunneling effect instead of diffraction. In the first configuration, we study the effect of gravity on the transmission through the cavity. For the second gravimeter, we prepare the effective ground state of…

  • FOMO2021 Abstracts

    Monjaraz, Cristian de Jesús López – Towards the implementation of a Dual Quantum Gravimeter based on 133Cs and 87Rb atoms

    Atom interferometry with neutral atoms has proven to be highly sensitive to inertial effects and this has made it a very significant area of research. Gravimeters based on atomic interference not only offer the ability to measure the value of local acceleration g with high accuracy, but also help validate highly relevant principles such as Einstein’s Equivalence Principle. The implementation of a gravimeter requires a series of well-defined elements such as the vacuum system, including the interferometric region, the laser system for the cooling, control and detection of atoms, and the control system to control the experiment. This work shows the progress of the construction of the first dual quantum…

  • FOMO2021 Abstracts

    Grinin, Alexey — QED tests and fundamental constants from frequency comb spectroscopy on hydrogen and deuterium

    Current calculations and experiments on quantum electrodynamics (QED) both achieve twelve digits of accuracy [1] making it an excellent test ground of the fundamental physics and searches for new physics. Two fundamental constants are obtained from hydrogen spectroscopy with highest precision: the Rydberg constant and the (rms) proton charge radius. While coherent sources in the deep UV are of great interest for both fundamental and applied physics, their usage has been so far limited by the difficulties to generate narrow line width laser sources in this region. Two-photon direct frequency comb spectroscopy [4] offers several unique features in this respect: efficient harmonics generation, low noise and narrow line widths, convenient…

  • FOMO2021 Abstracts

    Žlabys, Giedrius — Engineering time-space crystalline structures

    Time-space crystalline structures merge the ideas of time and space crystals to form a system that is periodic both temporally and spatially. The spatial part of the crystalline structure is created by an optical lattice and the temporal periodicity is engineered by choosing a proper resonant periodic driving of the spatial part. In the one-dimensional case, each site of the driven lattice comes equipped with a periodic temporal structure arising from the periodically oscillating localized wavepackets. Such a procedure creates a two-dimensional time-space crystalline structure. Extending the system to three spatial dimensions realizes a six-dimensional time-space crystalline structure which allows to probe high-dimensional condensed matter physics.

  • FOMO2021 Abstracts

    Kumar, Ankit — Jensen’s inequality and the nontrivial dynamics of fundamental forces

    Rutherford scattering is usually described by treating the projectile either classically or as quantum mechanical plane waves. We treat them as localised wave packets and study their head-on collisions with the stationary target nuclei. A comprehensive study of the quantum solutions reveals that the paradigmatic Rutherford scattering experiment is asymmetric in time. This nonclassical feature is traced back to the convexity properties of Coulomb interaction. Finally, we sketch how these theoretical findings could be tested in experiments looking for the onset of nuclear reactions.

  • FOMO2021 Abstracts

    Puthiya Veettil, Vishnupriya — Frequency stabilization using Saturation Absorption Spectroscopy.

    The aim of the project is to stabilize the Toptica DLC pro laser (780nm) by locking at F=2→F’=2, 3 crossover of 87Rb via Zeeman driving. A saturation absorption spectroscopy setup is designed to obtain the hyperfine levels of Rubidium with Doppler background subtraction. A resonant LC circuit of frequency 511 kHz is used for the Zeeman modulation of the atomic levels. The error signal obtained using a lock in amplifier setup is used for locking the laser at the required frequency. This will thereafter be used for cold atom experiments.

  • FOMO2021 Abstracts

    Martinez, Victor — Mass defect, time dilation and second order Doppler effect in trapped-ion optical clocks

    In this work we present a low-order relativistic correction to the multipolar atom-light Hamiltonian for two bound particles corresponding to a simple model for hydrogen-like atoms and ions. From this result, we can systematically predict frequency shifts in atomic clocks based on trapped ions due to the mass defect. We derive the fractional frequency shift with by the use of T-periodic ladder operators, treating the full dynamics of a Paul trap including micro-motion and non-perfect traps, finding accordance with previous results and new corrections with the cross talk of gravity and the so called excess micro-motion.

  • FOMO2021 Abstracts

    Mishra, Charu — Guidance of trapped clock states towards realization of rotation sensor

    Trapped and guided Sagnac interferometer have an advantage of achieving large effective area compared to free space Sagnac interferometer, which can increase the sensitivity of the rotation sensor. We are in the process of building such a rotation sensor. Our scheme employs atom chip that produce quadrupole fields in ring geometry and radio frequency chip to dress the atoms in the ring. Taking advantage of opposite signatures of Lande g-factors of clock states of 87Rb atoms, our scheme offers state dependent guidance of two clock states which can rotate in ring quadrupole to realize rotation sensor.

  • FOMO2021 Abstracts

    Li, Jing — A Feshbach engine on nonlinear coupled density-spin Bose-Einstein condensates

    Firstly, I will introduce a thermodynamic cycle using a Bose–Einstein condensate (BEC) with nonlinear interactions as the working medium. Exploiting Feshbach resonances to change the self-interaction strength of the BEC allows one to produce work by expanding and compressing the condensate. Then I investigate the effect of the shortcut to adiabaticity on the efficiency and power output of the engine and show that the tunable nonlinearity strength, modulated by Feshbach resonances, serves as a useful tool to enhance the system’s performance. Furthermore, I would like to explore the thermodynamical characteristics on the coupled density spin BEC driven by the quintic self-attraction in the same- and cross-spin channels. In addition, a…

  • FOMO2021 Abstracts

    Seedat, Adam — Optimized beam shapes for atom interferometry

    The sensitivity of atom interferometers to detect small changes in gravity is very important. Among other factors, the sensitivity of these devices is limited by the interference fringe contrast. Contrast is itself limited by dephasing, the decoherence of the Rabi oscillations of atoms over time. One method of reducing contrast which hasn't been explored much in the literature is by using a more optimum intensity profile of the interferometry beams incident on the atoms. Hence, I will present a method of determining the optimum profile of an atom interferometer for dephasing reduction. This is based around finding the appropriate trade-off between beam profile uniformity (which reduces dephasing caused by the…

  • FOMO2021 Abstracts

    Petrucciani, Tommaso — Spatial Bloch oscillations of a quantum gas in a “beat-note” superlattice

    In this work, I report the realization of a novel optical lattice for the manipulation of ultra-cold atoms, where arbitrarily large separation between the sites can be achieved without renouncing to the stability of retroreflected lattices. Superimposing two short-wavelength optical lattices with commensurated wavelengths, about 1µm each, I realize an intensity periodic pattern with a beat-note like profile where the regions with high amplitude modulation provide the potential minima for the atoms, which experience an effective lattice period around 10 µm. I employ a Bose-Einstein condensate to measure the energy gaps between the first three bands and study in-trap Bloch oscillation with negligible interaction in presence of small external forces.…

  • FOMO2021 Abstracts

    Giachetti, Guido — Presence of SSB and BKT scaling in d= 2 long-range XY model

    In the past decades considerable efforts have been made in orderto understand the critical features of long-range interacting models, i.e. those where the couplings decay algebraically as r^(−d−σ) withσ >0. According to the well-established Sak’s criterion for O(N) models, the short-range critical behavior survives up to a given σ∗≤2. However, the applicability of this picture to describe the the two dimensional classical XY model is complicated by the the presence, in the short-range regime, of a line of RG fixed points,which gives rise to the celebrated Berezinskii - Kosterlitz - Thouless (BKT) phenomenology. Our recent field-theoretical analysis finds there is not a specific, temperature-independent, value of σ∗: while for σ…

  • FOMO2021 Abstracts

    Morrison, Rhys — A Radio-Frequency Dressed Ringtrap for Cold Atom Interferometry

    I present a scheme that would allow for the controlled motion of cold atoms around a Sagnac interferometer through use of Radio-Frequency (RF) dressed magnetic traps. Multiple interesting geometries of traps have already been created for atoms in the microkelvin range. This talk will aim to give a brief overview of RF dressed traps, give examples of traps that have currently been realised in our experiment, and finally explain how these dressed traps may be used to perform atomic interferometry.

  • FOMO2021 Abstracts,  FOMO2021 Presentations

    Kang, Seji — Inertial sensing using an expanding atomic point source

    Point source atom interferometry (PSI) provides a compact tool to measure rotation and acceleration from phase differences between two atomic states. In an expanding laser-cooled atomic source within the π/2 - π - π/2  Raman pulses, rotation in the perpendicular plane to the Raman beams generates interferometer phases leading to spatial fringes in the atomic state populations. The acceleration along the Raman beam determines the phase offset to the fringes. Here, we introduce our recent methods for extracting rotation and acceleration from fringes and discuss about its sensitivity and stability.

  • FOMO2021 Abstracts

    Fiedler, Johannes — The role of dispersion forces in matter-wave scattering experiments

    Dispersion forces, such as van der Waals forces between neutral particles or Casimir-Polder forces between neutral particles and dielectric surfaces, are caused by the ground-state fluctuations of the electromagnetic field. They can be understood via an exchange of virtual photons that are generated as a dipole response of the particle due to the vacuum fluctuation of the field surrounding it. These resulting forces are weak for large separations and dramatically increase with decreasing distances. To this end, in matter-wave scattering experiments, where the beam particles reach close distances to the diffracted object, which is typical in the order of a few nanometers, these forces dominate the interaction and have a…

  • FOMO2021 Abstracts

    Béguin, Ashley — Large momentum transfer atom interferometer using sequential Bragg diffraction

    Light pulse atom interferometers are implemented for precision measurements in various areas such as gravito-inertial measurements or measuring fundamental constants. In addi- tion, atom interferometers with an increased sensitivity are potential candidates for testing fundamental physics in gravitation, dark sector physics, or for gravitational waves detection. In order to increase their sensitivity, a promising idea is to increase the momentum sepa- ration between the two arms of the interferometer. We are at present constructing such a Large Momentum Transfer (LMT) atom interferometer. Bragg diffraction is a corner stone for new schemes in the LMT beam splitters. In this “poster” session, I will present a 80 h ̄k LMT-interferometer based on sequential high order…

  • FOMO2021 Abstracts

    Biagioni, Giulio — Rotation of a dipolar supersolid

    Supersolids are a fundamental state of matter in which the same atoms that form a crystalline lattice are also responsible for the coherent flow of mass, typical of superfluids. In 2018, my group realized for the first time a supersolid phase in a quantum gas of strongly dipolar atoms. During the talk, I will focus on our latest work, in which we measure the moment of inertia of the dipolar supersolid [1]. We find that the moment of inertia of the supersolid is lower than the classical value, although the crystalline structure increases the moment of inertia compared to that of a standard superfluid. Our measurement directly demonstrates the superfluid…

  • FOMO2021 Abstracts

    Eneriz, Hodei — Loading and cooling in an optical trap via dark states

    Recently self-emergence phenomena, like glassiness and crystallization, have been extensively studied using pumped condensed atomic samples, coupled to a high finesse optical resonator. So far most of these experiments have been realized in standing wave cavities, which impose the resonator geometry to the lattice being formed by the atoms and the light scattered into the cavity modes. Adopting degenerate multimode cavities opens new horizons to study order emergence effects, where compliant lattices between atoms and light can show a dynamical evolution [1]. The optical cavity we use to study self-ordering has a bow-tie geometry [2] and the intra- cavity field is in a traveling wave configuration. Therefore, there are no…

  • FOMO2021 Abstracts

    Tzimkas-Dakis, Filippos — Super- and sub-radiance from strongly interacting atomic ensembles

    Super- and subradiance have been an active topic of research since the seminal paper of Dicke on collective emission of atoms confined within a distance that is small compared to the wavelength of the resonantly emitted radiation. The behaviour of the single and multiple-excitation states of interacting atoms can be understood in terms of the collective eigenstates of an effective non-Hermitian Hamiltonian, which exhibit enhanced (superradiant) and suppressed (subradiant) decay rates, together with level shifts (collective Lamb shift). Also, recent experiments have demonstrated both subradiance and superradiance in large, dilute atomic clouds. We will present the way such an atomic cloud decays to the ground state with two methods, the…

  • FOMO2021 Abstracts

    Bandarupally, Satvika — Atom Interferometry based on narrow linewidth transitions in Sr and Cd

    Atom interferometers with their extremely high sensitivity to inertial forces are an excellent method for investigating and understanding gravity and its gradi- ents. Due to the lack of a unified theory which puts the quantum mechanical nature of the world along with gravitational interactions (best explained by gen- eral relativity), studying gravity using quantum mechanical test sources, such as ultra-cold atoms, is an exciting choice for probing physics at this intersec- tion. In this brief talk, I will discuss work towards the realization of novel atom interferometers based upon Sr and Cd atoms, which posses a common electronic structure with two valence electrons, which provides access to narrow linewidth intercombination…

  • FOMO2021 Abstracts

    Antony, Vidhu Catherine — Analysis of the Optical Visibility of Graphite on different substrates and Van-der-Waals Hetero-structures

    The marked visibility of graphene is due to the phase shift in the interference colour. The study is based on the analysis of graphene visibility on various substrates and hetero-structures such as transition metal dichalcogenides (TMDCs) like Molybdenum Disulphide (MoS2) and hexagonal Boron Nitrite (h-BN). The visibility of graphene depends on the type of substrate, the thickness of the graphite layer, the thickness of various layers of the substrate and the incident wavelength. A comparison of the theoretically obtained contrast colour plots for each of the particular instances with the experimental images was made. The contrast of the graphite layer on the substrate was then calculated to figure out at which…

  • FOMO2021 Abstracts

    Examilioti, Pandora — Linear discrete diffraction and self-focusing in nonlinear lattices

    In this work, in the context of coupled-mode theory, I studied the discrete diffraction and the self-focusing effect in nonlinear optical lattices, under single-cite excitation. In the one and two-dimensional discrete diffraction, the spreading of the beam occurs due to the coupling between adjacent waveguides, while for a critical power and above the effect of self-focusing occurs. I studied the output distribution intensity for periodic, diatomic, and random lattices in one and two dimensions. It is observed that the amplitude, in which the self-focusing occurs, for periodic and diatomic lattices, has the same value. For random lattices with weak disorder, the amplitude is again the same, while for strong disorder,…

  • FOMO2021

    Ruhl, Joanna — Lagrange bracket approach to quantum fluctuations in macroscopic parameters of NLS breathers

    In the focusing nonlinear Schrodinger equation, multisoliton ”breathers” may be created from a single mother soliton by quenching the strength of the nonlinear interaction. In ultracold-gas realizations, atop the mother soliton there are quantum fluctuations coming from its underlying quantum many-body nature, computable from the Bogoliubov theory. Post-quench, these fluctu- ations become the fluctuations in the macroscopic parameters of the daughters, which exist in a coherent macroscopic quantum state. We present a mean-field formalism that uses Lagrange brack- ets to compute, from given pre-quench fluctuations, the fluctuations of the macroscopic parameters of the daughter solitons, with results for both the 2-soliton and 3-soliton breathers.