A5106177615- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Radioactive Decay and Measurement Techniques
- Scientific Measurement and Uncertainty Evaluation
- Geophysics and Gravity Measurements
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Spectroscopy and Laser Applications
- Geophysics and Sensor Technology
- Geomagnetism and Paleomagnetism Studies
- Astronomical Observations and Instrumentation
- Quantum Mechanics and Applications
- Adaptive optics and wavefront sensing
- Experimental Learning in Engineering
- Force Microscopy Techniques and Applications
- Pulsars and Gravitational Waves Research
- History and advancements in chemistry
- Cosmology and Gravitation Theories
- Inertial Sensor and Navigation
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Mechanical and Optical Resonators
- earthquake and tectonic studies
Systèmes de Référence Temps-Espace
2010-2024
Observatoire de Paris
2020-2023
Sorbonne Université
2013-2023
Université Paris Sciences et Lettres
2015-2023
Centre National de la Recherche Scientifique
2013-2023
Université Paris-Saclay
2023
Laboratoire National de Métrologie et d'Essais
2023
Collège de France
2015-2016
École Normale Supérieure - PSL
2015
Laboratoire Kastler Brossel
2015
Recent developments in quantum technology have resulted a new generation of sensors for measuring inertial quantities, such as acceleration and rotation. These can exhibit unprecedented sensitivity accuracy when operated space, where the free-fall interrogation time be extended at will environment noise is minimal. European laboratories played leading role this field by developing concepts tools to operate these relevant environment, parabolic flights, towers, or sounding rockets. With...
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...
Raman laser pulses are used to induce coherent tunneling between neighboring sites of a vertical 1D optical lattice. Such occurs when the detuning probe from atomic transition frequency matches multiples Bloch frequency, allowing for spectroscopic control coupling Wannier-Stark (WS) states. In particular, we prepare superpositions WS states adjacent sites, and investigate coherence time these by realizing spatial interferometer. This scheme provides powerful tool manipulation external...
We study the effects of rotations on a cold atom accelerometer onboard Nadir pointing satellite. A simulation satellite attitude combined with calculation phase interferometer allow us to evaluate noise and bias induced by rotations. In particular, we associated active compensation rotation due pointing. This was realized in context preliminary CARIOQA Quantum Pathfinder Mission.
A strong potential gain for space applications is expected from the anticipated performances of inertial sensors based on cold atom interferometry (CAI) that measure acceleration freely falling independent atoms by manipulating them with laser light.In this context, CNES and its partners initiated a phase 0 study, called CARIOQA, in order to develop Quantum Pathfinder Mission unlocking key features paving way future ambitious missions utilizing technology.As cornerstone implementation...
Using cold ${}^{87}$Rb atoms trapped in a one-dimensional (1D)-optical lattice, atomic interferometers involving coherent superpositions between different Wannier-Stark states are realized. Two kinds of interferometer schemes presented: Ramsey-type sensitive both to clock frequency and external forces, symmetric accordion-type interferometer, forces only. We evaluate the limits terms sensitivity accuracy those discuss their application as force sensors. As first step, we apply these...
We describe Doppler spectroscopy of Bose-Einstein condensates ytterbium atoms using a narrow optical transition. address the clock transition around 578 nm between ${^1}S_0$ and ${^3}P_0$ states with laser system locked on high-finesse cavity. show how absolute frequency cavity modes can be determined within few tens kHz high-resolution molecular iodine. that spectra reflect velocity distribution expanding in free fall or after releasing them inside an waveguide. demonstrate sub-kHz spectral...
Abstract The Matter-wave laser Interferometric Gravitation Antenna (MIGA) is an underground instrument using cold-atom interferometry to perform precision measurements of gravity gradients and strains. Following its installation at the low noise laboratory LSBB in South-East France, it will serve as a prototype for gravitational wave detectors with horizontal baseline 150 meters. Three spatially separated interferometers be driven by two common counter-propagating lasers measurement gradient...
Raman lasers are used as a spectroscopic probe of the state atoms confined in shallow one-dimensional (1D) vertical lattice. For sufficiently long laser pulses, resolved transitions bottom band lattice between Wannier Stark states corresponding to neighboring wells observed. Couplings such measured function intensity and compared theoretical predictions, from which depth can be extracted. Limits linewidth these investigated. Transitions higher bands also induced, well transverse for tilted...
A strong potential gain for space applications is expected from the anticipated performances of inertial sensors based on cold atom interferometry (CAI) that measure acceleration freely falling independent atoms by manipulating them with laser light. In this context, CNES and its partners initiated a phase 0 study, called CARIOQA, in order to develop Quantum Pathfinder Mission unlocking key features paving way future ambitious missions utilizing technology. As cornerstone implementation...
Cold atom interferometry (CAI)-based quantum accelerometers are very promising for future satellite gravity missions thanks to their strength in providing long-term stable and precise measurements of non-gravitational accelerations. However, limitations due the low measurement rate existence ambiguities raw sensor call hybridization accelerometer (Q-ACC) with a classical one (e.g., electrostatic) higher bandwidth. While previous studies have so far considered simple noise models Q-ACC...
For the CARIOQA-PMP Consortium Due to their performance especially at low frequencies, quantum sensors based on atom interferometry are expected enhance capabilities of future missions for earth observation. Atom interferometers, e.g. in a configuration as an accelerometer / gravimeter routinely operated laboratories and commercial versions exist. Additionally, payloads with demonstration experiments cold atoms were implemented microgravity platforms including parabola flights, drop tower,...
Located far from anthropical disturbances and with low seismic magnetic background noise profiles, the LSBB facility is ideal location for a new hybrid detector study of space-time strain. The MIGA infrastructure [1], utilizes an array atom interferometers manipulated by same beam, resonant optical field 150 m long cavity. constitutes method geophysics, characterization spatial temporal variations local gravity, demonstrator future decihertz gravitational wave observation. Such requires...
Recently, a new generation of experiments with ultracold quantum gases has emerged where the many-body properties are probed and manipulated using ultra-narrow "clock" transitions. We describe here our experimental project, which aims at engineering special kind optical lattice realizing an effective magnetic field coupling to atomic motion - Hofstadter lattice. Our specific scheme uses transition linking ground state metastable excited 174 Ytterbium atoms. present current status experiment,...
About 40 years ago, the neutrino was ruled out as dark matter particle based on several arguments. Here I use well-established concept of quantum uncertainties position and momentum to describe decoupling neutrinos from primordial plasma, which took place about half a second after Big Bang. In this way show that main arguments against are either wrong or have loopholes, conclude urgently needs be reconsidered, not 'hot', but 'cold' particle.