Institut des Sciences Moléculaires d'Orsay



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Home > Research Teams > Dynamics and Interactions: Radiation, Atoms and Molecules (DIRAM) > Quantum sensing and metrology

Quantum sensing and metrology

E. Charron
Doctorants: Sirine Amri (co-tutelle Univ. Hanovre), Annie Pichery (co-tutelle Univ. Hanovre)

Excitations collectives d'un condensat de Bose-Einstein

To exploit the full potential of quantum sensors for inertial applications and tests of fundamental physics, careful quantum state engineering schemes of ultra-cold atomic ensembles are required. For most applications, sensors based on atom interferometry promise few orders of magnitude boost in sensitivities compared to state-of-the-art performance if a macroscopic superposition or long drift times of several seconds are realized.

Degenerate quantum gases are prime candidates to rise to both challenges: slow expansion rates and high control of their degrees of freedom. Indeed, their energies can be realistically pushed down to the pico-Kelvin level or below while preserving coherence and being able to precisely shape their quantum properties.

Our research takes advantage of most novel and efficient techniques in the field of quantum gases theory and puts to work highly controllable atom interferometers of metrological significance. Analytical and numerical models are developed relying on optimal control theory protocols together with time-dependent quantum dynamics solvers at their core.

We engage in a direct collaborative effort with a large number of leading experimental groups, in particular with those at the Institute for Quantum Optics in Hanover, Germany. Our research covers, for example, aspects related to the dynamics of Bose-Einstein condensates manipulated by atom chips or dipole laser traps subject to free fall (fountains, microgravity and space platforms) or in trapped conditions (trapped interferometry, optical cavities, etc.).