Let's take a brief moment for a definition (from Wikipedia) : Quantum metrology is the study of making high-resolution and highly sensitive measurements of physical parameters using quantum theory to describe the physical systems, particularly exploiting quantum entanglement and spin squeezing.
... and this is exactly what we are doing here in the team within ARTEMIS UMR 7250 at the Mont Gros site of the Observatoire de la Côte d'Azur. But what measurements?
(i) Ultracold negative effective mass spin ensembles for quantum backaction accounting [UCNEM]
We are studying how an ultracold (~1 μK or less) spin ensemble could be used for back action accounting of large optomechanical systems (think mirrors in laser interferometers for gravitational wave detection) to suppress radiation pressure noise in an O5/post-O5 scientific context, targeting Virgo_nEXT and Einstein Telescope. [Check out Phys. Rev. Lett. 121 031101 and Phys. Rev. D 100, 062004].
(ii) Atomic clock interferometry for low energy fundamental physics : constraining potentials from non-relativisitic neutrinos [CHRYSANThèmE]
Can interference of two clocks travelling along different routes, one in freespace and another through an intricate test mass help reveal predictions of the Standard Model of Particle Physics? Can the sensitivity descend, bypassing the standard quantum limit via spin squeezing, to a level nearing Heisenberg's limit? We intend to find out... [Check out AVS Quantum Sci. 6, 014410 and Phys. Rev. D 101, 093004].
(iii) Applications of metrologically relevant squeezing to atom gradiometry : ultrafast earthquake detection [ALERT]
Strongly related and parallel to work on the MIGA large scale atom gradiometer and state-of-the-art gravimeters and gravity gradiometers, we posit that such quantum sensors could offer significant added value to seismometer networks to allow for faster earthquake observation, especially coupled with machine learning algorithms... and could be faster up to the speed of light for a sufficently sensitive quantum sensor relying on the perturbation of space-time and not the speed of travelling ground waves.
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We maintain equipment for local frequency metrology related to the aforementioned experiments. For potential academic and industrial collaborators, we list major infrastructure :
- Refimeve downlink [coming soon / in progress / on track for ~2027...]
- Enriched Acetylene (13C2H2) frequency modulation transfer spectroscopy (F/MTS) [in progress]
- Optical length-frequency reference and transfer cavity [in progress/planning, w/ E. Polini]
- Optical fiber delay line interferometer length-frequnecy reference [in progress/planning, w/ E. Polini and F. Kéfélian]
- Looking for a frequency comb in the future...
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Can you imagine yourself here? If so, feel free to use the contact form and reach out - let us know what interested you!
Keep an eye on the homepage where we will advertize funded opportunities.
We happily accept trainees for hands-on, one-on-one laboratory tutelage for interships, master projects, and doctoral studies.
We are keen to accept postdoctoral scholars and help elevate them to scientific or high technology positions - we offer connections, clear vision and planning, and a quality work enviornment!
