Autofeedback scheme for preservation of macroscopic coherence in microwave cavities

Details Autofeedback scheme for preservation of macroscopic coherence in microwave cavities Autofeedback scheme for preservation of macroscopic coherence in microwave cavities

1999-02-23

arxiv.org/abs/quant-ph/9902071v2

Phys. Rev. A 60, 1687 (1999)

Physics

Quantum Physics

revtex, 15 pages, 4 eps figures

Scientific paper

10.1103/PhysRevA.60.1687

We present a scheme for controlling the decoherence of a linear superposition of two coherent states with opposite phases in a high-Q microwave cavity, based on the injection of appropriately prepared ``probe'' and ``feedback'' Rydberg atoms, improving the one presented in [D. Vitali et al., Phys. Rev. Lett. 79, 2442 (1997)]. In the present scheme, the information transmission from the probe to the feedback atom is directly mediated by a second auxiliary cavity. The detection efficiency for the probe atom is no longer a critical parameter, and the decoherence time of the superposition state can be significantly increased using presently available technology.

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