FOMO2021

Contributed Talks (Abstracts)


  • Abbas, Hayat — Observation of quantum fluctuations via position to polarization converter
    Hybrid quantum system is used to observe the quantum effects like quantum fluctuations. It consists of an optomechanical system where a micromechanical membrane is strongly coupled to a high finesse cavity using position to polarization converter and couple it into Rb atoms.
  • Abidi, Mouine — Quantum Navigation
    Inertial measurements are the backbone for any highly accurate trajectory determination by tracking and integrating accelerations and rotation rates in all three spatial directions. In principle, inertial navigation provides autonomy and is therefore particularly attractive in areas without a line of sight to satellites (e.g. in buildings, tunnels, or in space) as required by GNSS-based ...
  • Antolini, Nicolo’ — Dimensional Crossover in superfluid – supersolid quantum phase transition
    The supersolid is a counterintuitive state of matter where atoms, arranged in a periodic crystal-like structure, can still flow coherently as they do in a superfluid. The supersolid has been recently observed in trapped quantum gases of strongly dipolar atoms, emerging from the crystallization of a superfluid Bose-Einstein condensate. In this work, we study for ...
  • 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 ...
  • Assendelft, Joep — Squeezing momentum states for atom interferometry
    We are working on a method to realise the creation of squeezed momentum states that can be used for atom interferometry. The idea behind the method is to perform a probing measurement on a narrow transition in the dispersive regime inside a ring cavity, such that we measure the relative population of the two momentum ...
  • Atkocius, Vilius — Ring lattice trap for neutral atoms with RF-dressed time-averaged adiabatic potentials
    We are working towards a matter-wave interferometer based on Sagnac effect that requires atoms to traverse an enclosed path to accumulate phase. Our scheme relies on time-averaged adiabatic RF-dressed potentials (TAAP) to guide neutral atoms around a circular path which will provide a scalable approach towards building a compact atom-based rotation sensor. I will present ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 . 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Chakraborty, Pratik — Aspects and Applications of Atom Interferometry for mid band frequency (0.1-10 Hz) Gravitational Waves detection.
    Since the first confirmed detection of gravitational wave (GW150914) on 14 September 2015 by LIGO, the detection of gravitational waves by terrestrial LASER interferometric detectors became a routine job. Despite their high sensitivity (100 Hz region), it is important to consider that such terrestrial interferometric detectors lose their sensitivity in the lower frequency region of ...
  • d’Armagnac, Quentin — Multi-axis quantum sensor for inertial navigation
    The iXAtom laboratory aims at improving classical inertial sensors with quantum technologies. In particular, my PhD focuses on developing a 3-axis hybrid inertial navigation system. The atom interferometer allows to measure the inertial components with high accuracy and no bias, while classical sensors have a high dynamic range and provide continuous measurements. If the 3-axis hybrid ...
  • 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 ...
  • 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 ...
  • Delvecchio, Michele — Static error compensation for multi-level interacting quantum systems
    Controlling experimental quantum systems is one of the challenges in the last years, both from a fundamental and practical perspective. One of the most significant application is the control of interacting systems, for instance, qubits in a quantum computer. In the latter case, in particular, one wants to perform quantum operations without errors, namely with ...
  • Donelli, Beatrice — Self-induced Josephson oscillations in a supersolid dipolar quantum gas
    Supersolid is a state of matter in which coexist both a periodic modulation, characteristic of the solid state, and the ability of the superfluid to flow without any friction. Its theoretical prediction dates back to 1960s, but it was experimentally observed for the first time two years ago, in a dipolar quantum gas. My research ...
  • Dunjko, Vanja — Quantum advantage in precision measurement with matter-wave solitons
    One-dimensional ultracold Bose gases with attractive atom-atom interactions support bright matter-wave solitons. Once a fundamental soliton is created, a four-fold quench in the interaction strength produces two daughter solitons. These, due to quantum fluctuations atop the mother soliton, are born in a coherent macroscopic superposition, their relative position described by a nearly minimum-uncertainty wavefunction. We show how this state can be ...
  • Eichelmann, Marcel — Theoretical investigation of the impact of semiconductor quantum dots on the morphology of wetting-layer states
    The excitation of semiconductor quantum dots often involves an attached wetting layer with delocalized single-particle energy eigenstates. These wetting-layer states are usually appro- ximated by (orthogonalized) plane waves. We will discuss why this approach even in the simpliest case of one (lens-shaped) quantum dot on the wetting layer is insufficient. Quantum states associated to the ...
  • Elertas, Gedminas — Matter-wave Atomic Gradiometer Interferometric Sensor (MAGIS)
    Matter-wave Atomic Gradiometer Interferometric Sensor (MAGIS) will be the largest vertical atom interferometry experiment, under construction at Fermilab. It consists of three 10 m atom interferometers across a 100-meter baseline. MAGIS will search for ultralight dark matter, test quantum mechanics in new regimes and serve as a technology demonstrator. The MAGIS-100 experiment is an intermediate ...
  • 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 ...
  • 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 ...
  • 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 . Superradiance is a collective phenomenon resulting in an enhanced single atom emission rate . A way to provide the required phase synchronization is coupling a cold cloud of atoms to a ...
  • 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 ...
  • Farrell, Liam — Analogue Hawking radiation as a quantum caustic
    In optics, caustics are bright, sharp lines and shapes created by the natural focusing of light. Some examples include rainbows, the wavy lines on the bottom of swimming pools, and the patterns produced by gravitational lensing. The intensity at a caustic diverges in the classical ray theory, but can be smoothed by taking into account ...
  • 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 ...
  • 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. ...
  • Gerstenecker, Benedikt — Ultracold Caesium on an Atomchip: An Atom Interferometer with Tunable Interactions
    The matter-wave properties of atoms and the macroscopic behavior of Bose-Einstein condensates make interference experiments with ultracold atoms a useful tool for both fundamental research and metrology applications. A unique design allows us to combine the advantages of atomchip technology with the flexibility of optical traps and furthermore the favorable magnetically induced Feshbach resonances in ...
  • 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 ...
  • 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 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 ...
  • Gulhane, Shreyas — On building matter-wave interferometer of Caesium atoms for the ‘g’ measurement
    Building local probes of gravity is of interest for both fundamental and environmental research. A compact as well as precise device for this purpose from the perspective of mobility is the demand and matter-wave interferometry is one of the interesting possible answers. The central idea of our setup is to make a gravimeter incorporating levitated ...
  • Hainge, Joshua — Caustics versus chaos in a kicked Bose-Einstein condensate
    We numerically study the quantum dynamics a bosonic Josephson junction (a Bose-Einstein condensate in a double-well potential) in the context of random periodic driving of the tunnel coupling. In particular, we examine how caustics which dominate the wavefunction in Fock space of the undriven system are affected by kicks which are random in both ...
  • 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. ...
  • Hawkins, Leonie — MAGIS-100: 100m atom interferometric quantum sensor
    MAGIS-100 is a 100 m scale quantum sensor to be built at Fermilab. It will be the world’s largest atom interferometry experiment and will be used to search for physics beyond the standard model. MAGIS will be composed of multiple atom interferometers spaced across a single baseline to measure a differential phase shift, allowing many ...
  • 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 ...
  • Hindley, Sam — MAGIS-100: A Matter-wave Atomic Gradiometer with Sensitivities to Dark Matter
    MAGIS-100 is a next-generation atom interferometer under construction at Fermilab that aims to explore fundamental physics over a 100-metre baseline, using the latest atomic clock technologies and new forces, while also providing an opportunity to test quantum mechanics at new length scales. The 100-metre baseline ...
  • Hsu Chung Chuan (Michael) — A compact and laser-induced source of ultracold strontium atoms
    We demonstrate a compact approach to generate ultracold strontium atoms and report trapping of 4.5 million atoms with a total system size of 0.5m$^3$. A novel ablation technique is implemented where pure strontium solid granules are ablated to produce atomic vapor, which is then loaded and trapped in a 3D magneto-optical trap (MOT) within a ...
  • 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 ...
  • Kamp, Denise — Quantum bifurcations in a Bose-Einstein condensate
    We model an atomic Bose-Einstein condensate (BEC) near an instability, looking for universal features. Instabilities are often associated with bifurcations where the classical field theory provided here by the Gross-Pitaevskii equation predicts that two or more solutions appear or disappear. Simple examples of such a situation can be realized in a BEC in a double ...
  • 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 ...
  • Kolb, Matthias — Towards a cold atom experiment with potassium for realizing the ‘Quantum Klystron’ and levitated atom interferometry
    We develop a setup suitable for cavity enhanced levitated atom interferometer which is capable of interaction times of several seconds . The Quantum Klystron mimics electromagnetic radiation by the ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Liebmann, Tobias — Controlling multipole moments of magnetic chip traps
    Magnetic chip traps are a standard tool for trapping atoms . While magnetic traps do provide good confinement potentials, they are not necessarily harmonic, in particular, they can exhibit strong cubic anharmonicity. In ...
  • López, Luis — Vibrational Postprocessing Module for a Quantum Gravimeter
    A quantum gravimeter measures the absolute acceleration of gravity g using atomic interferometry. In the interferometric process, a cold cloud of 87Rb atoms interact with two counter-propagating laser beams, which are produced from a single beam that is reflected off a mirror located at the end of the gravimeter’s flight tube. Thus, to achieve good precision on g among other ...
  • Luo, Chengyi — A Guided Matterwave Interferometer with Cavity Aided QND Readout
    Cavity-QED based approaches have succeeded in generating large amounts of entanglement enhancements beyond the standard quantum limit (SQL), which sets a fundamental imprecision on all quantum sensors with unentangled atoms and ...
  • 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 ...
  • 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 ...
  • 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 . 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 . In our approach, we first create highly entangled ...
  • Millen, Nathan — Teledyne e2v – Quantum Gravity Sensors
    Teledyne e2v have been developing a portable gravity gradiometer for use in civil engineering applications. In this talk I will go over the need for such a system and how the system uses matter-wave interferometry to produce increased sensitivity, stability and resolution for gravity gradient measurements.
  • 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 ...
  • 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 ...
  • 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 ...
  • Mukhopadhyay, Annesh — Probing zero-momentum excitations in the stripe phase of a spin-orbit coupled Bose-Einstein condensate
    Raman dressing of Bose-Einstein condensates is a highly flexible technique that pro- vides access to the study of interesting quantum phases. In a narrow range of parameters, an exotic supersolid-like stripe phase exists that combines superfluid properties with the breaking of translational symmetry. By using a weak optical lattice in combination with spin-orbit coupling, the ...
  • New, Joshua — CMOS Atom Chips: A lab on a Chip
    Cold atom interferometry has proven to be a promising technology for creating high precision inertial sensors, measuring fundamental constants and testing physics such as the WEP. Currently, cold atom devices are constrained by their size, requiring an entire lab to function which limits portability. A route to overcome this issue is with fully integrated atom ...
  • 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 ...
  • Ome, Md. Kamrul Hoque –Galilean Invariance and Lattice Dynamics in a Zeeman Lattice
    Quantum gases at near absolute zero temperature exhibit pronounced quantum mechanical effects which make them powerful testbeds for probing complex dynamics connected to open questions in other areas of modern physics, such as quantum optics, quantum information, or condensed matter physics. In this work, we demonstrate one of the applications of quantum gases to the ...
  • Pareek, Vinay — Cavity Enhanced Microscopy
    Imaging is a vital aspect of research in biology and physics. Many interesting samples are very difficult to image because of their minimal interaction with light. I am developing Cavity Enhanced Microscopy (CEMIC) as a novel imaging technique for ultra-low optical density samples. After establishing the technique using artificially created structures, I will ...
  • Pasatembou, Elizabeth — Mars, Dark Matter, and Everything in-between
    For fundamental physics to go forward, good use of modern technologies and tools needs to be made. Machine learning and quantum technologies are two examples of tools that can be used to drive physics forward. With ever-expanding datasets coming from space missions, it is becoming increasingly more difficult for scientists to manually analyse data. I ...
  • Pedalino, Sebastian — High-mass matter-wave interferometry
    Vienna’s Long-Baseline Universal Matter-wave Interferometer (LUMI) has successfully demonstrated interference of massive molecules consisting of up to 2000 atoms and with masses up to 28.000 amu. LUMI’s high force sensitivity of 10-26 N has also been used to sense electronic, optical, magnetic and structural properties of a very diverse class of particles. I will discuss ...
  • Perez, Veronica — Grid-based holograms for matter waves lithography: fabrication parameters and resolution
    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 ...
  • 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 ...
  • 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 ...
  • Rajagopalan, Ashwin — Hybridizing an atom interferometer with an opto-mechanical resonator
    Atom interferometers can perform absolute measurements of inertial effects with extremely high sensitivities and long term stability in comparison to its classical counterparts. Their measurement accuracy and long term stability have made them an ideal candidate in areas such as inertial sensing and navigation . While performing measurements in dynamic field environments an atom interferometer’s ...
  • 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 ...
  • Rodzinka, T — Bose-Einstein Condensate and Bragg diffraction for atom interferometry
    We are constructing an atom interferometer with a large momentum separation between the interferometer’s arms. This would significantly improve atom gyroscopes and accelerom- eters sensitivities. Beyond inertial effects, in our group, we are interested in measurements where the macroscopic spatial separation between the two arms is essential. For example, measurements where the influence of fields ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Sowa, Piotr — Easy setup for observation of two independent lasers interference
    A simple, student lab-level experiment containing interference of two totally independent lasers inside. We used different configurations of lasers, both HeNe and diode ones, to directly obtain interference fringes photos with 27÷87% contrast on typical cameras.
  • 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 ...
  • Tomasz Krehlik — EIT spectroscopy in warm Rb vapour – towards preparation of the coupling beam for cold-atoms experiments
    I will present an experimental setup designed for studying electromagnetically induced transparency (EIT) in a ladder scheme of Rb atoms. The highest level of the ladder can be an easily accesible 5D level, as well as the chosen Rydberg state with n about 50. The discrimination of population and coherence effects was performed, showing an ...
  • 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 ...
  • Upasna, Mtech — Crack formation due to volcanic eruption and measurements of gravity anomaly due to magma-filled dikes
    we are studying the crack formation due to volcanic eruption and measurements of gravity anomaly due to magma-filled dikes. This is done with the help of quantum gravimeter which is based on atom interferometer. We will also demonstrate the gelatin based model to study the crack propagation . Some other fluids of different densities and ...
  • Vinelli, Giuseppe — Measurement of the Gravitational Behaviour of Antimatter
    The QUPLAS (QUantum interferometry with Postitrons and LASers) experiment aims to test the gravity theory by measuring the Positronium (Ps) fall in the Earth’s gravitational field. Such measurement would be a test of the Weak Equivalence Principle and the CPT symmetry and is further motivated by the lack of information on antimatter that could improve ...
  • Wald, Sebastian — Novel Single-Side-Band Stabilization Method for Laser Frequency Shifting
    Precision laser frequency control is a key requirement for experiments in AMO Physics. At infrared wavelengths, single-sideband modulators offer a frequency tuning of several GHz. Such electro-optic modulators have a dual-parallel Mach-Zehnder interferometer structure. By tuning the phases of the interferometer arms, the carrier and the one sideband can be suppressed. However, drifts in the ...
  • 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 ...
  • Werner, Michael — Phase shifts of atom interferometers in curved PPN-spacetimes
    I will present a systematic approach to calculate the phase shifts associated to a variety of different interferometer geometries in a curved PPN spacetime. This spacetime geometry is a generalization of Einsteins GR and therefore may give rise to novel quantum tests of relativity. The whole analysis is done in a fashion, which is easy ...
  • 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 ...
  • Yuelong (武跃龙) — Few-body atomic spectroscopy based on cold 6Li atoms
    Neutral lithium has a relatively simple three-electronic structure and thus accurate theoretical calculations including quantum electrodynamics (QED), isotope shift, and relativistic corrections can be obtained from many-body wave functions. The development of high precision spectroscopy of lithium offers a benchmark to such theories and can be used to determine the nuclear radius and measure ...
  • 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 ...