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.
@article{arxiv.quant-ph/0004025,
title = {Quantum Feedback for Protection of Schroedinger-cat states},
author = {Mauro Fortunato and Paolo Tombesi and David Vitali and Jean-Michel Raimond},
journal= {arXiv preprint arXiv:quant-ph/0004025},
year = {2016}
}
Comments
LaTeX, 11 pages, 2 figures, uses sprocl.sty. Based on a talk given by M. Fortunato at the 1998 Lecce Conference on Foundation of Quantum Mechanics, to appear in the Conference Proceedings (World Scientific, Singapore, 2000)