FOMO2022 Invited Talk

Invited Talk: Probing Many Body Quantum Systems by Matter Wave Interference
Jörg SchmiedmayerVienna Center for Quantum Science and Technology (VCQ), Atominstitut, TUWien Interacting many body quantum systems, their dynamics and relaxation, are at the centre of many interesting physics problems ranging from particle creation in the early universe to the properties of quantum materials.Ultracold atoms are a model system to build quantum many body systems and study their description by quantum fields in the lab. In this talk I will give an overview of the different possibilities interference experiments offer to probe many body systems and their underlying quantum description.In a first set of experiments, we look at a quench which splits a single onedimensional system (quantum field) into two parallel…

Invited Talk: Quantum Gases in Space for Fundamental Physics and Earth Observation
Naceur Gaaloul Leibniz University of Hannover, Germany Spaceborne quantum technologies and more particularly atombased devices are announcing a new era of strategic, intense space exploitation. Indeed, space offers a unique environment characterized by low noise and lowgravity necessary for a wide spectrum of applications ranging from time and frequency transfer to Earth observation and the exploration of fundamental laws of physics.In this contribution, we report about two recent mission concepts based on the use of quantumgas sensors. The first is the satellite mission SpaceTime Explorer and QUantum Equivalence Principle Space Test (STEQUEST), currently a phase2 candidate for the M7 launch opportunity of the European Space Agency’s science programme. STEQUEST, with…

Invited Talk: Observation of a gravitational AharonovBohm effect and its implications for quantum superpositions of Newtonian gravitational fields
Mark KasevichStanford University, USA The gravitational interaction of a tungsten source mass with atomic wavepackets has been observed in an atom deBroglie wave interferometer, in a regime where the separation distance between the interfering wavepackets is comparable to their distance to the source mass. We will discuss this experiment in the context of AharonovBohm effects. We will describe the relevance of these results to observation of quantum superpositions of Newtonian gravitational fields.

Invited Talk: Helmut Rauch and matter wave interferometry
Wolfgang P. Schleich1 Institut für Quantenphysik and Center for Integrated Quantum Science and Technology(IQST), Universität Ulm, AlbertEinsteinAllee 11, D89081 Ulm, Germany2 Hagler Institute for Advanced Study and Department of Physics and Astronomy, Institutefor Quantum Science and Engineering (IQSE), Texas A&M AgriLife Research, Texas A&MUniversity, College Station, Texas 778434242, USA In this talk we pay respect to the impressive achievements of Helmut Rauch not only in the field of neutron optics but also his paving the way of matter wave interferometry. His numerous discoveries and deep insight into the inner workings of quantum mechanics have been a guidance to all of us.The superposition principle is a cornerstone of quantum mechanics and…

Invited Talk: Persistent currents for ultracold fermions on a ring
Anna MinguzziCNRS and Universite Grenoble Alpes, LPMMC, Grenoble France We study the persistent currents of an interacting Fermi gas confined in a tightly confining ring trap and subjected to an artificial gauge field. For attractive interactions, we study the currents all through the BCSBEC crossover. At weak attractions, on the BCS side, fermions display a parity effect in the persistent currents, i.e. their response to the gauge field is paramagnetic or diamagnetic depending on the number of pairs on the ring. At resonance and on the BEC side of the crossover, we find a halving of the periodicity of the groundstate energy as a function of the artificial gauge field…

Invited Talk: Clock Atom Interferometry and Floquet Atom Optics
Jan Rudolph,1 Thomas Wilkason,2 Megan Nantel,2 Yijun Jiang,2 Benjamin E. Garber,1 Hunter Swan,1 Samuel P. Carman,1 Mahiro Abe,1 and Jason M. Hogan11Department of Physics, Stanford University, Stanford, California 94305, USA2Department of Applied Physics, Stanford University, Stanford, California 94305, USA Clock atom interferometry (AI) describes the coherent manipulation of an atomic twolevel system separated by an optical frequency difference. It makes use of narrow transitions to metastable statescommonly used in optical atomic clocks. In contrast to conventional AI, such transitions can be driven resonantly using a single laser beam, which has promising implications for the suppression of laser frequency noise [1], a fundamental limitation for some of the most challenging applications…

Invited Talk: Oneminute coherence in an opticallattice based atom interferometer
Holger MuellerUC Berkeley In quantum metrology and quantum information processing, a nonclassical state must undergo a quantum process before unwanted interactions with the environment lead to decoherence. In atom interferometry, the nonclassical state is a coherent spatial superposition of partial wave packets and the process might be, e.g., accumulation of sufficient phase shift to allow detection of extremely weak interactions, such as the gravitational field of a small proof mass. The coherence in atomic fountains is limited by the available freefall time in Earth’s gravitational field. This can be overcome by suspending the wave packets in an optical lattice, which has so far reached up to 20 s of coherence,…

Invited Talk: Joint massandenergy test of the equivalence principle with atom interferometers
MingSheng Zhan11Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China The equivalence principle (EP) is a basic assumption of the general relativity. Quantum test of EP with atoms is an important way to examine the applicable scope of the current physical framework, so as to discover new physics. Recently we improve the fourwave doublediffraction Raman transition method (4WDR) [1] we proposed before to select atoms with a certain mass and angular momentum state, and form a dualspecies atom interferometer. By using the extended 4WDR to 85Rb and 87Rb atoms with specified mass and internal energy we carry out…

Invited Talk: Neutron interferometry for studies of experimental quantum mechanics
Yuji Hasegawa1,21Atominstitut, TUWien, Stadionallee 2, A1020 Vienna, AUSTRIA2Division of Applied Physics, Hokkaido University, Sapporo, Hokkaido, 0600808, JAPAN Neutron interferometers provide ideal situations of experimental observations of interference between coherently split, wellseparated beams of matter waves, in this case neutron de Broglie waves. Interferometers made of perfect silicon crystal was invented for xrays in 1964 and first performance with neutrons was confirmed by Rauch, Treimer and Bonse at the Atominstitut, Vienna in 1974. The Atominstitut was distinguished as an EuropeanPhysicalSociety (EPS) Historic Site on 22 May 2019. Over the past almost half century, neutron interferometer experiments are bringing impact on fundamental quantum and neutron physics [13].Since the timeindependent Schrödinger equation, i.e.,…

Invited Talk: Superfluid quantum Bose gas on a shell
Hélène PerrinUniversité Sorbonne, France Quantum gases provide us with a very convenient and widely tunable system for the study of superfluidity. In particular, they can be confined in a large variety of geometries (harmonic traps, optical lattices, box traps, lower dimensional traps…), enabling the study of superfluid dynamics with specific constrains. In this talk I will present the behaviour of a superfluid quantum gas confined at the surface of an ellipsoid: the atoms can move freely in directions parallel to the surface and are strongly confined in the transverse direction. In a first series of experiments, the atoms initially at rest at the bottom of the shell because of gravity…

Invited Talk: Determination of the finestructure constant using atom interferometry
Léo Morel1, Zhibin Yao1, P. Cladé1 and S. GuellatiKhelifa1,21Laboratoire Kastler Brossel, Sorbonne University, CNRS, ENSPSL University, College de France, 4 place Jussieu, 75005 Paris, France2Conservatoire National des Arts est Métiers, 292 rue Saint Martin, 75003 Paris, France To test the standard model, we need to know the parameters that scale the fundamental interactions. Among them, the fine structure constant which characterizes the strength of the electromagnetic interaction and thus plays a crucial role in quantum electrodynamics calculations. Using atom interferometry to measure the quotient ħ/mRb of the reduced Planck’s constant and the mass of a rubidium87 atom, we obtained the most accurate determination of the fine structure constant α=1/137.035999206(11) with…

Invited Talk: Accurate measurement of atom surface CasimirPolder interaction
C. Garcion1, J. Lecore1, Q. Bouton1, N. Fabre1, F. Perales1, M. Ducloy1, and G. Dutier1, S. Scheel2, N. Gaaloul3 1Universite Sorbonne Paris Nord, Laboratoire de Physique des Lasers, CNRS, (UMR 7538), F93430, Villetaneuse, France2Institut fur Physik, Universitat Rostock, AlbertEinsteinStrae 2324, D18059 Rostock, Germany and3Institute of Quantum Optics (IQO), Gottfried Wilhelm Leibniz University, 30167 Hannover Germany Atom surface CasimirPolder potential is intrinsically dicult to measure due to distances between atom and surface smaller than few 100 nm. To conceive an experiment devoted to an accurate measurement in such a range of distance is complicated. We have chosen to build an hybrid system using nanotechnology facilities and cold atoms potentiality. We realised,…

Invited Talk: Quantum control of an array of optically levitated nanoparticles
Uros DelicUniversity of Vienna The field of quantum optomechanics aims to exploit lightmatter interaction in order to realize macroscopic quantum states of massive solidstate mechanical objects. Within optomechanics, optically levitated dielectric nanoparticles have emerged as a promising platform for tests of fundamental physics, development of novel sensing techniques or investigation of complex nonequilibrium physics. Optical trapping provides unique possibilities for quantum state preparation, for example through engineering of dynamic and nonlinear optical potentials. I will discuss recent experimental advances in levitated optomechanics, such as the motional quantum ground state preparation [1] and the observation of nonreciprocal optical interactions between two nanoparticles [2]. The rapidly developing control toolbox allows us to…

Invited Talk: From new ways of free electron control to the coherence of multielectron pulses
Peter HommelhoffUniversity of Erlangen, Germany Electric and magnetic fields generated from microstructures allow complex field configurations. We use this approach to build chipbased guides, i.e. twodimensional Paul traps, for free lowenergy electrons (1 eV to keV level). In addition, we have demonstrated guided electron beamsplitters and other elements, ideally suited for matter wave experiments with electrons. In the second part of the talk, I will show that fully coherent electron beams can be easily generated from needle tip emitters, including coherent electron pulses with femtosecond time resolution. Because of the charged nature of the electrons, their coherence is reduced even for a mean number of 1 electron per pulse due…

Invited Talk: Cold Atom Quantum Technology to Explore Fundamental Physics
Oliver BuchmuellerImperial College London I will outline in the presentation the scientific opportunities of a multistage programme based on cold atom quantum technology. The central goals of the programme are to search for ultralight dark matter, to explore gravitational waves in the midfrequency range between the peak sensitivities of LISA and LIGO/Virgo/ KAGRA/INDIGO/Einstein Telescope/Cosmic Explorer experiments, and to probe other frontiers in fundamental physics. This programme would complement other planned searches for dark matter, as well as probe mergers involving intermediatemass black holes and explore earlyuniverse cosmology.I will especially focus on key activities in the field: the recently funded AION project [1] in the UK, the proposed space mission proposal…

Invited Talk: Creating a massive minimal uncertainty wavepacket using GrossPitaevskii breathers
Maxim Olshanii (Olchanyi)University of Massachusetts Boston We assess the difficulties in creating a provably coherent quantum state of a relative motion of two bosonic solitons using GrossPitaevskii breathers. The scheme for creating such statea fourfold quench of the interactions applied to a bosonic soliton is not new. However, an experimental proof of a macroscopic coherence is difficult. Our proposal is to suggest a protocol where variances of the relative distance and the relative momentum are experimentally accessible: then whenever the product of the two gets close to the Heisenberg uncertainty limit, such state can be declared to be coherent. We present an extensive numerical study on the subject.The projects are…

Invited Talk: Strapdown Quantum Inertial Measurement Unit
B. Battelier, Q. d’Armagnac de Castanet, and P. BouyerLP2N, Laboratoire Photonique, Numérique et Nanosciences,Université Bordeaux–IOGS–CNRS:UMR 5298, 1 rue Francois Mitterrand, 33400 Talence, France S. Templier, P. Cheiney, B. Gouraud, V. Jarlaud, V. Menoret, B. Desruelle, H. Porte, and F. NapolitanoiXblue, 34 rue de la Croix de Fer, 78105 SaintGermainenLaye, France B. BarrettDepartment of Physics, University of New Brunswick,8 Bailey Dr., Fredericton NB, E3B 5A3, Canada Since their first demonstration in the early 1990s, atom interferometers have proven to be excellent absolute inertial sensors—having been exploited as ultrahigh sensitivity instruments for fundamental tests of physics and as stateoftheart atomic gravimeters. As a result, they have been proposed as next generation sensors…

Invited Talk: Dark matter searches with matter wave interferometry
Invited Talk by Andrei Derevianko: Dark matter searches with matter wave interferometry

Invited Talk: Multiphoton Atom Interferometry via cavityenhanced Bragg Diffraction
D. O. Sabulsky1, J. Junca 1, X. Zou1, A. Bertoldi1, M. Prevedelli2, Q. Beaufils3, R. Geiger3, A. Landragin3, P. Bouyer1, and B. Canuel1 (MIGA Consortium) 1 LP2N, Laboratoire Photonique, Numérique et Nanosciences, Université BordeauxIOGSCNRS:UMR 5298, rue F. Mitterrand, F33400 Talence, France2 Dipartimento di Fisica e Astronomia, Universita di Bologna, Via BertiPichat 6/2, I40126 Bologna, Italy3 LNESYRTE, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, 61 avenue de l´Observatoire, F75014 Paris, France(Dated: August 22, 2022) We present our horizontal multiphoton atom interferometer driven via Bragg diffraction enhanced in an optical resonator. A large interrogation mode (4 mm 1/e2 diameter) is necessary in such a system, as the atoms cross the interrogation…

Invited Talk: MatterWaves lensing in Dynamic WaveGuides
We have recently demonstrated smooth and controllable matterwave guides by transporting BoseEinstein condensates (BECs) over macroscopic distances without any heating or decohering their internal quantum states [9]. A neutralatom accelerator ring was utilized to bring BECs to very high speeds (up to 16 times their sound velocity) and transport them in a magnetic matterwave guide for 15 centimetres whilst fully preserving their internal coherence. We then use a magnetogravitational matterwave lens to collimate and focus matterwaves in ringshaped timeaveraged adiabatic potentials. This “Deltakick cooling” sequence of BoseEinstein condensates reduces their expansion energies by a factor of 46 down to 800 pK. Compared to the stateoftheart experiments, requiring zero gravity or large…