A5089365236- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Advanced Fiber Laser Technologies
- Geophysics and Sensor Technology
- Mechanical and Optical Resonators
- Quantum, superfluid, helium dynamics
- Solid State Laser Technologies
- Scientific Measurement and Uncertainty Evaluation
- Advanced MEMS and NEMS Technologies
- Advanced Measurement and Metrology Techniques
- Force Microscopy Techniques and Applications
- Radioactive Decay and Measurement Techniques
- Quantum optics and atomic interactions
- Photorefractive and Nonlinear Optics
- Strong Light-Matter Interactions
- Laser Material Processing Techniques
- Quantum many-body systems
- Semiconductor Quantum Structures and Devices
- Acoustic Wave Resonator Technologies
- Astronomical Observations and Instrumentation
- Physics of Superconductivity and Magnetism
- Spectroscopy and Quantum Chemical Studies
- Topological Materials and Phenomena
- History of Science and Natural History
Systèmes de Référence Temps-Espace
2016-2025
Université Paris Sciences et Lettres
2016-2025
Sorbonne Université
2016-2025
Centre National de la Recherche Scientifique
2014-2025
Observatoire de Paris
2016-2025
Sorbonne Paris Cité
2024
Laboratoire National de Métrologie et d'Essais
2019-2023
Deleted Institution
2015-2019
Université Paris-Sud
2014-2016
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016
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...
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 measure the position- and momentum-space breathing dynamics of trapped one-dimensional Bose gases at finite temperature. The profile in real space reveals sinusoidal width oscillations whose frequency varies continuously through quasicondensate to ideal gas crossover. A comparison with theoretical models taking temperature into account is provided. In momentum space, we report first observation a doubling regime, corresponding self-reflection mechanism due repulsive interactions. Such...
Analyzing the noise in momentum profiles of single realizations one-dimensional Bose gases, we present experimental measurement full momentum-space density correlations ⟨δn_{p}δn_{p^{'}}⟩, which are related to two-body correlation function. Our data span weakly interacting region phase diagram, going from ideal gas regime quasicondensate regime. We show experimentally that bunching phenomenon, manifests itself as super-Poissonian local fluctuations space, is all regimes. The is, however,...
We present the exact solution for many-body wavefunction of a one-dimensional mixture bosons and spin-polarized fermions with equal masses infinitely strong repulsive interactions under external confinement. Such model displays large degeneracy ground state. Using generalized Bose-Fermi mapping, we find whole set ground-state wave functions degenerate manifold characterize them according to group-symmetry considerations. that density profile momentum distribution depends on symmetry...
We investigate the momentum distribution of weakly interacting 1D Bose gases at thermal equilibrium both experimentally and theoretically. Momentum single is measured using a focusing technique, whose resolution we improve via guiding scheme. The compares very well with quantum Monte Carlo calculations for Lieb-Liniger model finite temperature, allowing an accurate thermometry gas that agrees (and improves upon) based on in situ density fluctuation measurements. quasi-condensation crossover...
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...
We consider a mixture of one-dimensional strongly interacting Fermi gases with up to six components, subjected longitudinal harmonic confinement. In the limit infinitely strong repulsions we provide an exact solution which generalizes one for two-component mixture. show that imbalanced under confinement displays partial spatial separation among structure depends on relative population various components. Furthermore, symmetry characterization ground and excited states introducing evaluating...
We explore the properties of ultranarrow spectral holes in ensembles solid-state emitters crystals over a range sub-kelvin temperatures, as new step toward leveraging their exceptional coherence more effectively. As an example, we consider potential gain observed application frequency stabilization schemes. investigate how parameters used to burn hole impact its shape, and these factors determine minimum achievable linewidth. In addition stability hole's center frequency, linewidth contrast...
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...
Rare-earth-doped crystals have numerous applications ranging from frequency metrology to quantum information processing. To fully benefit their exceptional coherence properties, the effect of mechanical strain on energy levels dopants---whether it is a resource or perturbation---needs be considered. We demonstrate that by applying uniaxial stress rare-earth-doped crystal containing spectral hole, we can shift hole controlled amount larger than width hole. deduce sensitivity...
We investigate the frequency response of narrow spectral holes in a doped crystal structure as function temperature below 1 K. identify particular regime which this significantly deviates from expected two-phonon Raman scattering theory. Namely, near 290 mK, we observed behavior exhibiting temperature-dependent shift zero to first order. This is interest for applications that require high stability, such laser stabilization, by operating scheme at specific point would result hole being...
We derive the density functional for ground-state energy of a two-dimensional, spin-polarized gas neutral fermionic atoms with magnetic-dipole interaction, in Thomas-Fermi-Dirac approximation. For many harmonic trap, we give analytical solutions single-particle spatial and energy, dependence on interaction strength, discuss weak-interaction limit that is relevant experiments. then lift restriction full spin polarization account time-independent inhomogeneous external magnetic field. The...
The Matter-Wave laser Interferometer Gravitation Antenna, MIGA, will be a hybrid instrument composed of network atom interferometers horizontally aligned and interrogated by the resonant field an optical cavity. This detector provide measurements sub Hertz variations gravitational strain tensor. MIGA bring new methods for geophysics characterization spatial temporal local gravity also demonstrator future low frequency Gravitational Wave (GW) detections. enable better understanding coupling...
We present an experimental technique for realizing a specific absorption spectral pattern in rare-earth-doped crystal at cryogenic temperatures. This is subsequently probed on two channels simultaneously, thereby producing error signal allowing frequency locking of laser the said pattern. Appropriate combination leads to substantial reduction detection noise, paving way ultra-stable which noise can be made arbitrarily low when using multiple channels. use this realize with instability $ 1.7...
We consider a strongly interacting one-dimensional (1D) Bose-Fermi mixture confined in harmonic trap. It consists of Tonks-Girardeau (TG) gas (1D Bose with repulsive hard-core interactions) and noninteracting Fermi spin-aligned gas), both species through interactions. Using generalized mapping, we determine the one-body density matrices, exact particle profiles, momentum distributions, behavior under 1D expansion when opening In real space, bosons fermions do not display any phase...
We report on interleaved operation of a cold-atom inertial sensor, where three atomic clouds are simultaneously probed in an atom interferometer featuring 4 Hz sampling rate and interrogation time 801 ms. Interleaving improves the sensitivity by efficiently averaging vibration noise allows us to perform dynamic rotation measurements so far unexplored range. demonstrate 30 nrad.s <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> ·Hz...
The possibility of generating a narrow spectral hole in rare-earth doped crystal opens the gateway to variety applications, one which is realization an ultrastable laser. As this achieved by locking prestabilized laser hole, prerequisite elimination frequency fluctuations hole. One potential source such can arise from temperature instabilities. However, when surrounded buffer gas subject same as crystal, effect temperature-induced pressure changes may be used counterbalance direct...
Material strain has recently received growing attention as a complementary resource to control the energy levels of quantum emitters embedded inside solid-state environment. Some rare-earth ion dopants provide an optical transition which simultaneously narrow linewidth and is highly sensitive strain. In such systems, technique spectral hole burning, in transparent window burned within large inhomogeneous profile, allows one benefit from features, are also strain, while working with ensembles...
The agile generation and control of multiple optical frequency modes combined with the realtime processing multi-mode data provides access to experimentation in domains such as optomechanical systems, information processing, spectroscopy. latter, specifically spectroscopy spectral-hole burning (SHB), has motivated our development a heterodyne laser interferometric scheme centered around software-defined radio platform for signal an entirely open-source environment. A challenge SHB is high...