Exploring the quantum world with photons trapped in cavities and Rydberg atoms
J. M. Raimond · 2014
Abstract This chapter presents a review of the latest achievements in cavity quantum electrodynamics with Rydberg atoms. In particular, it illustrates an example of quantum feedback, which is the stabilization of a Fock state in the cavity against spontaneous emission. The feedback process involves the rapid measurement of atoms passing through the cavity and performing a quantum nondemolition measurement of its photon number. The information is fed to a processor that in real time computes the right classical signal to send to the cavity to re-pump it in the right way.