A5018726211- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Advanced Frequency and Time Standards
- Geophysics and Sensor Technology
- Geophysics and Gravity Measurements
- Scientific Measurement and Uncertainty Evaluation
- Advanced Fiber Laser Technologies
- Geophysical and Geoelectrical Methods
- Seismic Waves and Analysis
- Laser Design and Applications
- Inertial Sensor and Navigation
- Quantum Information and Cryptography
- Mass Spectrometry Techniques and Applications
- Advanced Electrical Measurement Techniques
- Quantum optics and atomic interactions
- Dark Matter and Cosmic Phenomena
- Advanced Materials Characterization Techniques
- Atmospheric and Environmental Gas Dynamics
- Black Holes and Theoretical Physics
- Pulsars and Gravitational Waves Research
- Atomic and Molecular Physics
- Electrochemical Analysis and Applications
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Cosmology and Gravitation Theories
California Institute of Technology
2024
Jet Propulsion Laboratory
2023-2024
University of Birmingham
2020-2024
Systèmes de Référence Temps-Espace
2014-2023
Deleted Institution
2014-2020
Laboratoire National de Métrologie et d'Essais
2017
Sorbonne Université
2017
Observatoire de Paris
2017
We outline the experimental concept and key scientific capabilities of AION (Atom Interferometer Observatory Network), a proposed programme using cold strontium atoms to search for ultra-light dark matter, explore gravitational waves in mid-frequency range between peak sensitivities LISA LIGO/Virgo/ KAGRA/INDIGO/Einstein Telescope/Cosmic Explorer experiments, probe other frontiers fundamental physics. would complement planned searches as well mergers involving intermediate-mass black holes...
Abstract The sensing of gravity has emerged as a tool in geophysics applications such engineering and climate research 1–3 , including the monitoring temporal variations aquifers 4 geodesy 5 . However, it is impractical to use cartography resolve metre-scale underground features because long measurement times needed for removal vibrational noise 6 Here we overcome this limitation by realizing practical quantum gradient sensor. Our design suppresses effects micro-seismic laser noise, thermal...
Wavefront aberrations are identified as a major limitation in quantum sensors. They today the main contribution uncertainty budget of best cold atom interferometers based on two-photon laser beam splitters, and constitute an important limit for their long-term stability, impeding these instruments from reaching full potential. Moreover, they will also remain obstacle future experiments large momentum splitters. In this article, we tackle issue by using deformable mirror to control actively...
This paper outlines the centralized design and production of ultra-high-vacuum sidearm laser-stabilization systems for AION Ultra-Cold Strontium Laboratories. Commissioning data on residual gas steady-state pressures in chambers, magnetic field quality, laser stabilization, loading rate 3D magneto-optical trap are presented. Streamlining stabilization enabled Collaboration to build equip parallel five state-of-the-art Laboratories within 24 months by leveraging key expertise collaboration....
Improving global navigation satellite systems (GNSS) requires a more stable basis of timekeeping. Cold-atom clocks are currently the most accurate time references, but large. This article presents an atomic clock, ``Rubiclock'', that is compact and portable, thanks to fiber-based laser bench, isotropic light cooling, atoms remain motionless during operating sequence. configuration gives clock important benefit in microgravity; measurements performed on 0-$g$ flights show better stability...
Abstract Large-scale atom interferometers promise unrivaled strain sensitivity to mid-band gravitational waves, and will probe a new parameter space in the search for ultra-light scalar dark matter. These proposals require gradiometry with kilometer-scale baselines, momentum separation above 10 4 ℏ k between interferometer arms, optical transitions long-lived clock states reach target sensitivities. Prohibitively high power wavefront flatness requirements have thus far limited maximum...
We perform the experimental demonstration of method proposed in [Phys. Rev. A 91, 063615 (2015)] to extract differential phase dual atom interferometers. From a single magneto-optical trap, we generate two atomic sources, vertically separated and free-falling synchronously, with help an accelerated lattice. drive simultaneous Raman interferometers onto use correlation vibration signal measured by seismometer each interferometer. demonstrate optimal sensitivity extracted between...
We propose and demonstrate a scheme for Doppler compensated optical cavity enhancement of atom interferometers at significantly increased mode diameters. This overcomes the primary limitations in interferometry, circumventing linewidth limit enabling spatial filtering, power enhancement, large beam diameter simultaneously. approach combines magnified linear with an intracavity Pockels cell. The cell induces voltage-controlled birefringence allowing frequencies to follow Raman lasers as they...
Abstract Coherent manipulation of atoms with atom-optic light pulses is central to atom interferometry. Achieving high pulse efficiency essential for enhancing fringe contrast and sensitivity, in particular large-momentum transfer interferometers which use an increased number pulses. We perform investigation optimizing the frequency domain by using tailored polychromatic fields, demonstrate possibility deliver high-efficiency resilient even situation inhomogeneous atomic clouds laser beams....
Quantum atomic sensors based on atom interferometry (AI) have recently led to the development of new techniques for measurement inertial forces, finding important applications in both fundamental physics and applied research. As these types begun mature, they received increasing interest deployment field even space. There has been significant effort past reducing size complexity system size, weight, power (SWaP) challenging environments such as Here, we report a design assembly low-SWaP...
Abstract Optical clocks have well surpassed the frequency stability performance of microwave clocks. They been mainly limited to tabletop setups and large rack-mount systems. Miniaturizing optical will make new technology capability more ubiquitously applied applications from navigation fundamental science. Here we aim develop a miniature space clock (mSOC) with size compact capable achieving short-term 10 −14 τ −1/2 noise floor −16 . In this paper, describe mSOC concept, discuss...
Recent advances in the understanding and control of cold atom systems have resulted devices with extraordinary metrological performance. To further improve performance these systems, additional methods noise reduction are needed. Here, we examine possible from vacuum compatible low reflection coatings by characterizing a black coating its compatibility Magneto-Optical Trap (MOT). We demonstrate that commercially available PCO35® provides low-reflectivity surfaces ultra-high compatible. The...
Wavefront aberrations are identified to be an important limit in the accuracy of cold atom interferometers based on two-photon transitions, such as gyroscopes, gravimeters and gradiometers. We used a MEMS deformable mirror actively control Raman laser wavefronts gravimeter compensate for distortions induced by optical elements proof principle experiment.
Abstract The sensing of gravity has emerged as an important tool in geophysics for applications such engineering and climate research 1,2,3 where it provides the capability to probe otherwise inaccessible features under surface Earth. Examples include monitoring temporal variations those found aquifers 4 geodesy 5 . However, resolving metre scale underground is rendered impractical by long measurement times needed removal vibrational noise 6 Here, we overcome this limitation open up field...
Vapor cell atomic clocks are an interesting technology because they combine compactness, low power consumption and excellent relative frequency stability. Recently, due to better performing laser sources innovative techniques prepare detect the atoms, several cell-based prototypes exhibiting unprecedented stability have been developed. These allow a reduction in transfer of noise improvement signal-to-noise ratio subsequently clock's The project IND55 Mclocks funded by European Metrological...
A full-operated and turn-key clock laser is based on a compact Fabry Perot cavity developed for the Yb ion clock. The disk shape with 2 inch diameter 9.3 mm thickness. Though size, features vibration insensitive design allowing sensitivity 10-10/g level. installed in two-layer thermal shield 10 hours time constant which dramatically suppresses room temperature impact cavity. By optimizing induced noise, frequency stability of referenced to this measured at 2×10-14, mainly limited by noise.
This paper outlines the centralised design and production of Ultra-High-Vacuum sidearm Laser-Stabilisation systems for AION Ultra-Cold Strontium Laboratories. Commissioning data on residual gas steady-state pressures in chambers, magnetic field quality, laser stabilisation, loading rate 3D Magneto-Optical Trap are presented. Streamlining stabilisation enabled Collaboration to build equip parallel five state-of-the-art Laboratories within 24 months by leveraging key expertise collaboration....
Wavefront aberrations are today the main contribution in inaccuracy budget of best cold atom interferometers [1, 2], based on laser beam splitters, and constitute an important limit for their long-term stability [1]. They prevent from exploiting full potential these interferometers. In this work, we report active control wavefronts interferometry demonstrate a proof-of-principle experiment compensation using, first time, deformable mirror inertial sensor.