Parameter estimation using the emitted light of a collective atomic system

Atomic ensembles can be interfaced with optical cavities and waveguides, which allows to engineer collective interactions between the atoms, both of coherent and dissipative nature.  This leads to the emergence of interesting phenomena such as pattern formation, super/subradiance, or the generation of quantum correlations. In this seminar, I will consider a collective atomic system that displays a nonequilibrium phase transition between a stationary and an oscillatory phase. I will present the signatures of these phases in the emitted light. Then, I will discuss how the emitted light can be used for sensing applications. In particular, I will characterize fundamental bounds on the precision by which one can estimate perturbations in the parameters of the system. As we will see, the collective behaviour of the atoms deeply influences the sensitivity of the system to different kind of perturbations. Finally, I will discuss measurement protocols that can exploit such sensitivity.

Presential in the seminar room. Zoom link:

https://zoom.us/j/98286706234?pwd=bm1JUFVYcTJkaVl1VU55L0FiWDRIUT09