Dotsenko, I; Bernu, Julien; Deleglise, S; Sayrin, C; Brune, M; Raimond, J M; Haroche, S; Mirrahimi, M; Rouchon, P
We explore experimentally the fundamental projective properties of a quantum measurement and their application in the control of a system's evolution. We perform quantum non-demolition (QND) photon counting on a microwave field trapped in a very-high-Q superconducting cavity, employing circular Rydberg atoms as non-absorbing probes of light. By repeated measurement of the cavity field we demonstrated the freeze of its initially coherent evolution, illustrating the back action of the photon...[Show more]
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