文献类型：期刊文献

英文题名：Enhancing parameter precision of optimal quantum estimation by quantum screening

作者：Huang, Jiang[1]; Guo, You-Neng[2]; Xie, Qin[1]

机构：[1] Physical and Photoelectric Science Department, Guangdong Ocean University, Zhanjiang, 524088, China; [2] Department of Electronic and Communication Engineering, Changsha University, Changsha, 410003, China

年份：2015

卷号：25

期号：2

外文期刊名：Chinese Physics B

收录：EI(收录号：20160701930533)、Scopus(收录号：2-s2.0-84957831277)

语种：英文

外文关键词：Fisher information matrix - Excited states - Quantum optics - Ground state

外文摘要：We propose a scheme of quantum screening to enhance the parameter-estimation precision in open quantum systems by means of the dynamics of quantum Fisher information. The principle of quantum screening is based on an auxiliary system to inhibit the decoherence processes and erase the excited state to the ground state. By comparing the case without quantum screening, the results show that the dynamics of quantum Fisher information with quantum screening has a larger value during the evolution processes. ? 2016 Chinese Physical Society and IOP Publishing Ltd.