Decoherence and the retrieval of lost information
Mesoscale and Nanoscale Physics
2015-05-30 v2 Quantum Physics
Abstract
We found that in contrast with the common premise, a measurement on the environment of an open quantum system can {\em reduce} its decoherence rate. We demonstrate it by studying an example of indirect qubit's measurement, where the information on its state is hidden in the environment. This information is extracted by a distant device, coupled with the environment. We also show that the reduction of decoherence generated by this device, is accompanied with diminution of the environmental noise in a vicinity of the qubit. An interpretation of these results in terms of quantum interference on large scales is presented.
Keywords
Cite
@article{arxiv.1109.4027,
title = {Decoherence and the retrieval of lost information},
author = {Yin Ye and Yunshan Cao and Xin-Qi Li and Shmuel Gurvitz},
journal= {arXiv preprint arXiv:1109.4027},
year = {2015}
}
Comments
9 pages, 8 figures, additional explanations added, Phys. Rev. B, in press