Entropy as a measure of the noise extent in a two-level quantum feedback controlled system |
| |
Authors: | Wang Tao-Bo Fang Mao-Fa and Hu Yao-Hua |
| |
Institution: | College of Physics and Information Science, Hunan Normal University, Changsha 410081, China |
| |
Abstract: | By introducing the von Neumann entropy as a measure of the extent of
noise, this paper discusses the entropy evolution in a two-level
quantum feedback controlled system. The results show that the
feedback control can induce the reduction of the degree of noise, and
different control schemes exhibit different noise controlling
ability, the extent of the reduction also related with the position
of the target state on the Bloch sphere. It is shown that the
evolution of entropy can provide a real time noise observation and a
systematic guideline to make reasonable choice of control strategy. |
| |
Keywords: | quantum entropy quantum feedback |
本文献已被 维普 等数据库收录! |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
| 点击此处可从《中国物理 B》下载免费的PDF全文 |
|