A5011615299- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Geophysics and Sensor Technology
- Scientific Measurement and Uncertainty Evaluation
- Radioactive Decay and Measurement Techniques
- Quantum many-body systems
- Strong Light-Matter Interactions
- Mechanical and Optical Resonators
- Quantum Mechanics and Applications
- Quantum, superfluid, helium dynamics
- Advanced Materials Characterization Techniques
- Laser Design and Applications
- Advanced Fiber Laser Technologies
- Pulsars and Gravitational Waves Research
- Optical and Acousto-Optic Technologies
- Advanced Thermodynamics and Statistical Mechanics
- Quantum Information and Cryptography
- Chemical Thermodynamics and Molecular Structure
- Quantum optics and atomic interactions
- Cosmology and Gravitation Theories
- Hemodynamic Monitoring and Therapy
- Opinion Dynamics and Social Influence
- Theoretical and Computational Physics
- Laser-induced spectroscopy and plasma
Observatoire de Paris
2015-2024
Sorbonne Université
2014-2024
Centre National de la Recherche Scientifique
2014-2024
Laboratoire National de Métrologie et d'Essais
2016-2024
Systèmes de Référence Temps-Espace
2014-2023
Deleted Institution
2014-2023
Université Paris Sciences et Lettres
2016-2022
Laboratoire Charles Fabry
2009-2017
Centre National d'Études Spatiales
2009-2017
TU Wien
2013-2016
Detecting multiple temperatures Most people have an intuitive understanding of temperature. In the context statistical mechanics, higher temperature, more a system is removed from its lowest energy state. Things become complicated in nonequilibrium governed by quantum mechanics and constrained several conserved quantities. Langen et al. showed that as many 10 temperature-like parameters are necessary to describe steady state one-dimensional gas Rb atoms was split into two particular way (see...
Abstract We propose in this White Paper a concept for space experiment using cold atoms to search ultra-light dark matter, and detect gravitational waves the frequency range between most sensitive ranges of LISA terrestrial LIGO/Virgo/KAGRA/INDIGO experiments. This interdisciplinary experiment, called Atomic Experiment Dark Matter Gravity Exploration (AEDGE), will also complement other planned searches exploit synergies with wave detectors. give examples extended sensitivity matter offered...
We present an underground long baseline atom interferometer to study gravity at large scale. The hybrid atom-laser antenna will use several interferometers simultaneously interrogated by the resonant mode of optical cavity. instrument be a demonstrator for gravitational wave detection in frequency band (100 mHz - 1 Hz) not explored classical ground and space-based observatories, interesting potential astrophysical sources. In initial configuration, standard interferometry techniques adopted,...
We report the operation of a cold-atom inertial sensor which continuously captures rotation signal. Using joint interrogation scheme, where we simultaneously prepare source and operate an atom interferometer (AI) enables us to eliminate dead times. show that such continuous improves short-term sensitivity AIs, demonstrate $100\ \text{nrad.s}^{-1}.\text{Hz}^{-1/2}$ in gyroscope $11 \ \text{cm}^2$ Sagnac area. also stability $1 \text{nrad.s}^{-1}$ at $10^4$ s integration time, establishes...
The relaxation of isolated quantum many-body systems is a major unsolved problem connecting statistical and physics. Studying such processes remains challenge despite considerable efforts. Experimentally, it requires the creation manipulation well-controlled truly systems. In this context, ultracold neutral atoms provide unique opportunities to understand nonequilibrium phenomena because large set available methods isolate, manipulate, probe these Here, we give an overview rapid experimental...
We propose a new detection strategy for gravitational waves (GWs) below few hertz based on correlated array of atom interferometers (AIs). Our proposal allows us to reduce the Newtonian noise (NN), which limits all ground GW detectors hertz, including previous interferometry-based concepts. Using an long baseline AI gradiometers yields several estimations NN, whose effect can thus be reduced via statistical averaging. Considering km current optical detectors, NN rejection factor 2 could...
Cold-atom inertial sensors target several applications in navigation, geoscience and tests of fundamental physics. Reaching high sampling rates sensitivities, obtained with long interrogation times, represents a challenge for these applications. We report on the interleaved operation cold-atom gyroscope, where 3 atomic clouds are interrogated simultaneously an atom interferometer featuring 3.75 Hz rate time 801 ms. Interleaving improves sensitivity by efficiently averaging vibration noise,...
We detail the experimental observation of non-equilibrium many-body phenomenon prethermalization. study dynamics a rapidly and coherently split one-dimensional Bose gas. An analysis based on use full quantum mechanical probability distributions matter wave interference contrast reveals that system evolves toward quasi-steady state. This state, which can be characterized by an effective temperature, is not final thermal equilibrium compare evolution to integrable Tomonaga–Luttinger liquid...
We describe the relaxation dynamics of a coherently split one-dimensional (1D) Bose gas in harmonic approximation. A dephased, prethermalized state emerges light-cone-like evolution which is connected to spreading correlations with characteristic velocity. In our description we put special emphasis on influence longitudinal trapping potential and finite size system, both are highly relevant experiments. particular, quantify their phase correlation properties velocity established. Finally,...
We experimentally study the dynamics of a degenerate one-dimensional Bose gas that is subject to continuous outcoupling atoms. Although standard evaporative cooling rendered ineffective by absence thermalizing collisions in this system, we observe substantial cooling. This proceeds through homogeneous particle dissipation and many-body dephasing, enabling preparation otherwise unexpectedly low temperatures. Our observations establish scaling relation between temperature number, provide...
A rotating interferometer with paths that enclose a physical area exhibits phase shift proportional to this and the rotation rate of frame. Understanding origin so-called Sagnac effect has played key role in establishment theory relativity pushed for development precision optical interferometers. The fundamental importance motivated realization experiments test its validity waves beyond optical, but measurements remained challenge. Here, we report accurate matter waves, by using Cesium atom...
We study the nonequilibrium dynamics of a coherently split one-dimensional Bose gas by measuring full probability distribution functions matter-wave interference. Observing system on different length scales allows us to probe excitations energy scales, revealing two distinct length-scale-dependent regimes relaxation. measure crossover scale separating these and identify it with prethermalized phase-correlation system. Our approach enables direct observation multimode characterizing quantum systems.
We propose an experiment to test the weak equivalence principle (WEP) with a mass consisting of two entangled atoms different species. In proposed experiment, coherent measurement differential gravity acceleration between atomic species is considered, by entangling atom interferometers operating on The entanglement heralded at initial beam splitter through detection single photon emitted either atoms, together impossibility distinguishing which photon. contrast current and tests WEP, our...
The research on cold-atom interferometers gathers a large community of about 50 groups worldwide both in the academic and now industrial sectors. interest this sub-field quantum sensing metrology lies panel possible applications sensors for measuring inertial gravitational signals with high level stability accuracy. This review presents evolution field over last 30 years focuses acceleration effort 10 years. article describes physics principle gravito-inertial as well main parts hardware...
We present a compact and stable dual-wavelength laser source for onboard atom interferometry with two different atomic species. It is based on frequency-doubled telecom lasers locked femtosecond optical frequency comb. take advantage of the maturity fiber technology to reduce number free-space components which are intrinsically less stable, make setup immune vibrations thermal fluctuations. The provides agility phase stability required can easily be adapted other cold experiments. have shown...
Developments in atom interferometry have led to atomic inertial sensors with extremely high sensitivity. Their performances are for the moment limited by ground vibrations, impact of which is exacerbated sequential operation, resulting aliasing and dead time. We discuss several experiments performed at LNE-SYRTE order reduce these problems achieve intrinsic limit sensors. These techniques resulted transportable high-performance instruments that participate gravity measurements, pave way...
Abstract We describe the realization and characterization of a compact, autonomous fiber laser system that produces optical frequencies required for cooling, trapping, manipulation, detection 87 Rb atoms - typical atomic species emerging quantum technologies. This device, customized from Muquans company, is designed use in challenging operating environment Laboratoire Souterrain à Bas Bruit (LSBB) France, where new large scale atom interferometer being constructed underground MIGA antenna....
Gravitational Waves (GWs) were observed for the first time in 2015, one century after Einstein predicted their existence. There is now growing interest to extend detection bandwidth low frequency. The scientific potential of multi-frequency GW astronomy enormous as it would enable obtain a more complete picture cosmic events and mechanisms. This unique entirely new opportunity future astronomy, success which depends upon decisions being made on existing infrastructures. prospect combining...
We propose a scheme for testing the weak equivalence principle (universality of free-fall (UFF)) using an atom-interferometric measurement local differential acceleration between two atomic species with large mass ratio as test masses. An apparatus in free fall can be used to track trajectories over distances. show how extracted from interferometric signal Bayesian statistical estimation, even case and laser wavelength difference. that this estimation method does not suffer noise platform...
The uniformity of the intensity and phase laser beams is crucial to high-performance atom interferometers. Inhomogeneities in profile cause contrast reductions systematic effects interferometers operated with sources at micro-Kelvin temperatures detrimental diffraction shifts using large momentum transfer beam splitters. We report on implementation a so-called top-hat long-interrogation-time cold-atom interferometer overcome issue inhomogeneous encountered when Gaussian beams. characterize...
We propose a method of joint interrogation in single atom interferometer which overcomes the dead time between consecutive measurements standard cold atomic fountains. The operation enables for faster averaging Dick effect associated with local oscillator noise clocks and vibration inertial sensors. Such an allows one to achieve lowest stability limit due shot noise. demonstrate multiple up five clouds atoms are interrogated simultaneously setup. essential feature operation, demonstrated...
We are building a hybrid detector of new concept that couples laser and matter-wave interferometry to study sub Hertz variations the strain tensor space-time gravitation. Using set atomic interferometers simultaneously manipulated by resonant optical field 200 m cavity, MIGA instrument will allow monitoring evolution gravitational at unprecedented sensitivity, which be exploited both for geophysical studies Gravitational Waves (GWs) detection. This infrastructure embedded into LSBB...
We study theoretically and experimentally the influence of temporally shaping light pulses in an atom interferometer, with a focus on phase response interferometer. show that smooth pulse shapes allow rejecting high frequency fluctuations (above Rabi frequency) thus relax requirements noise or interrogation lasers driving The shape is also shown to modify scale factor which has be taken into account evaluation its accuracy budget. discuss trade-offs operate when choosing particular shape, by...