Quantum Feedback for Protection of Schroedinger-cat states

Details Quantum Feedback for Protection of Schroedinger-cat states Quantum Feedback for Protection of Schroedinger-cat states

2000-04-06

arxiv.org/abs/quant-ph/0004025v1

Physics

Quantum Physics

LaTeX, 11 pages, 2 figures, uses sprocl.sty. Based on a talk given by M. Fortunato at the 1998 Lecce Conference on Foundation

Scientific paper

We review the use of quantum feedback for combatting the decoherence of Schroedinger-cat-like states in electromagnetic cavities, with special emphasys on our recent proposal of an automatic mechanism based on the injection of appropriately prepared ``probe'' and ``feedback'' Rydberg atoms. In the latter 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 linear superposition state can be significantly increased using presently available technology.

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