Field locked to a Fock state by quantum feedback with single photon corrections

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X. Zhou, I. Dotsenko, B. Peuadecerf, T. Rybarczyk, C. Sayrin, S. Gleyzes, J.M. Raimond, M. Brune, S. Haroche


DOI: 10.1103/PhysRevLett.108.243602
PACS: 42.50.Pq, 03.67.Pp, 42.50.Dv

Fock states with photon numbers n up to 7 are prepared on demand in a microwave superconducting cavity by a quantum feedback procedure that reverses decoherence-induced quantum jumps. Circular Rydberg atoms are used as quantum nondemolition sensors or as single-photon emitter or absorber actuators. The quantum nature of these actuators matches the correction of single-photon quantum jumps due to relaxation. The flexibility of this method is suited to the generation of arbitrary sequences of Fock states.