A5042602996- Pulsars and Gravitational Waves Research
- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
- Gamma-ray bursts and supernovae
- Photonic and Optical Devices
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Geophysics and Sensor Technology
- Cosmology and Gravitation Theories
- Force Microscopy Techniques and Applications
- Advanced Fiber Laser Technologies
- High-pressure geophysics and materials
- Cold Atom Physics and Bose-Einstein Condensates
- Astrophysics and Cosmic Phenomena
- Quantum Information and Cryptography
- Statistical and numerical algorithms
- Atomic and Subatomic Physics Research
- Acoustic Wave Resonator Technologies
- Advanced Thermodynamics and Statistical Mechanics
- Adaptive optics and wavefront sensing
- Experimental and Theoretical Physics Studies
- Radio Astronomy Observations and Technology
- Magnetic confinement fusion research
- Advanced Measurement and Metrology Techniques
- Advanced Frequency and Time Standards
Laboratoire Kastler Brossel
2016-2025
Collège de France
2015-2025
Sorbonne Université
2015-2024
Centre National de la Recherche Scientifique
2015-2024
École Normale Supérieure - PSL
2015-2024
Université Paris Sciences et Lettres
2015-2024
École Normale Supérieure
2020
Marie Curie
2020
Laboratoire Photonique, Numérique et Nanosciences
2017
ARC Centre of Excellence for Engineered Quantum Systems
2016
We describe an experiment in which a mirror is cooled by the radiation pressure of light. A high-finesse optical cavity with coated on mechanical resonator used as optomechanical sensor Brownian motion mirror. feedback mechanism controls this via laser beam reflected have observed either cooling or heating mirror, depending gain loop.
Current interferometric gravitational-wave detectors are limited by quantum noise over a wide range of their measurement bandwidth. One method to overcome the limit is injection squeezed vacuum states light into interferometer's dark port. Here, we report on successful application this technology improve shot sensitivity Advanced Virgo detector. A enhancement up 3.2±0.1 dB beyond achieved. This nonclassical improvement corresponds 5%–8% increase binary neutron star horizon. The squeezing was...
We experimentally demonstrate the high-sensitivity optical monitoring of a micro-mechanical resonator and its cooling by active control. Coating low-loss mirror upon resonator, we have built an optomechanical sensor based on very high-finesse cavity (30000). measured thermal noise with quantum-limited sensitivity at 10^-19 m/rootHz level, cooled down to 5K cold-damping technique. Applications our setup range from quantum optics experiments experimental demonstration ground state macroscopic...
Light scattering by a two-dimensional photonic-crystal slab (PCS) can result in marked interference effects associated with Fano resonances. Such devices offer appealing alternatives to distributed Bragg reflectors and filters for various applications, such as optical wavelength polarization filters, reflectors, semiconductor lasers, photodetectors, bio-sensors non-linear components. Suspended PCS also have natural applications the field of optomechanics, where mechanical modes suspended...
Owing to their strong dipole moment and long coherence times, superconducting qubits have demonstrated remarkable success in hybrid quantum circuits. However, most qubit architectures are limited the GHz frequency range, severely constraining class of systems they can interact with. The fluxonium qubit, on other hand, be biased very low while being manipulated read out with standard microwave techniques. Here, we design operate a heavy an unprecedentedly transition $1.8~\mathrm{MHz}$. We...
Optical interferometry is by far the most sensitive displacement measurement technique available, with sensitivities at 10^-20 m/rootHz level in large-scale gravitational-wave interferometers currently operation. Second generation will experience a 10-fold improvement sensitivity and be mainly limited quantum noise, close to Standard Quantum Limit (SQL), once considered as ultimate achievable interferometry. In this Letter, we experimentally demonstrate one of techniques envisioned go beyond...
The quantum effects of radiation pressure are expected to limit the sensitivity second-generation gravitational-wave interferometers. Though ubiquitous, such so weak that they have not been experimentally demonstrated yet. Using a high-finesse optical cavity and classical intensity noise, we radiation-pressure induced correlations between two beams sent into same moving mirror cavity. Our scheme can be used retrieve at level has applications both in high-sensitivity measurements optics.
The quantum radiation pressure and the shot noise in laser-interferometric gravitational wave detectors constitute a macroscopic manifestation of Heisenberg inequality. If can be easily observed, observation has been elusive, so far, due to technical competing with effects. Here, we discuss evidence Advanced Virgo detector. In our experiment, inject squeezed vacuum states light into interferometer order manipulate backaction on 42 kg mirrors observe corresponding driven displacement at...
We experimentally demonstrate a cancellation of back-action noise in optical measurements. Back-action was first proposed within the framework gravitational-wave detection by dual resonators as way to drastically improve their sensitivity. have developed an experiment based on high-finesse Fabry-Perot cavity study radiation-pressure effects ultrasensitive displacement Using intensity-modulated intracavity field mimic quantum noise, we report observation due coherent mechanical response...
We present the Python Red Pitaya Lockbox (PyRPL), an open source software package that allows implementation of automatic digital feedback controllers for quantum optics experiments on commercially available, affordable Field-Programmable Gate Array (FPGA) boards. Our implements generation various types error signals, from analog input through application loop filters high complexity and real-time gain adjustment multiple output including different algorithms resonance search, lock...
We describe an experiment in which a laser beam is sent into high-finesse optical cavity with mirror coated on mechanical resonator. show that the reflected light very sensitive to small displacements. have observed Brownian motion of resonator high sensitivity corresponding minimum observable displacement 2 × 10−19 m/√Hz.
We study the nonlinear dynamics induced in suspended nanomembranes by their clampings. The nonlocal character of nonlinearity is demonstrated via intermode couplings. also monitor resonator phase-space trajectory and characterize its mechanical response presence a strong pump excitation. observe shift oscillation frequency phase conjugation mode. Such effects are inherent to any submicron-scale expected play role quantum as well.
Three-mode parametric interactions occur in triply-resonant optomechanical systems: photons from an optical pump mode are coherently scattered to a high-order by mechanical motion of the cavity mirrors, and these modes resonantly interact via radiation pressure force when certain conditions met. Such effects predicted long baseline advanced gravitational-wave detectors. They can energy into acoustic modes, leading instability, but they also extract energy, cooling. We develop large amplitude...
We have designed a micromechanical resonator suitable for cavity optomechanics. used micropillar geometry to obtain high-frequency mechanical resonance with low effective mass and very high quality factor. coated 60-μm diameter low-loss dielectric mirror on top of the pillar are planning use this micromirror as part high-finesse Fabry-Perot laser cool down its quantum ground state monitor position fluctuations by quantum-limited optical interferometry.
Although the main loss channel of planar microwave superconducting resonators has been identified to be related an external coupling a two-level system (TLS) bath, behavior such in presence off-resonant pump yet fully understood. Alongside well-known power-dependent damping, we observe frequency shift with conspicuous maximum for intermediate power that is attributed spectrally asymmetric saturation TLSs. We derive semiclassical model describes both these effects quantitatively. The...
We present an experimental study of the internal mechanical vibration modes a mirror. determine frequency repartition acoustic resonances via spectral analysis Brownian motion mirror, and spatial profile by monitoring their response to resonant radiation pressure force swept across mirror surface. have applied this technique mirrors with cylindrical plano-convex geometries, compared results theoretical predictions. in particular observed gaussian predicted for mirrors.
We present the optical optimization of an optomechanical device based on a suspended InP membrane patterned with 2D near-wavelength grating (NWG) photonic-crystal geometry. first identify by numerical simulation set geometrical parameters providing reflectivity higher than 99.8 % over 50-nm span. then study limitations induced finite value waist and lateral size NWG pattern using different approaches. The grating, pierced in 265 nm-thick membrane, is used to form compact microcavity...
We present a free-space optomechanical system operating in the 1-K range. The device is made of high mechanical quality factor micropillar with high-reflectivity optical coating atop, combined an ultra-small radius-of-curvature coupling mirror to form high-finesse Fabry-Perot cavity embedded dilution refrigerator. environment as well cryostat have been designed ensure low vibrations and preserve micron-level alignment from room temperature down 100 mK.
We experimentally demonstrate the high-sensitivity optical monitoring of moving micromirrors, made low-loss dielectric coatings upon silicon resonators various shapes and sizes.The record finesses obtained (F ≃ 30 000) has allowed us to measure thermal noise micromirrors at room temperature with a quantum-limited sensitivity 10 -19 m/ √ Hz level completely characterize their mechanical behaviour, in excellent agreement results finite-element computation.Applications such optomechanical...