Optimal parameter estimation of open quantum systems

被引：0
|
作者：
嵇英华 [1 ,2 ]
柯强 [1 ,2 ]
胡菊菊 [1 ,2 ]
机构：
[1] College of Physics and Communication Electronics Jiangxi Normal University
[2] Key Laboratory of Photoelectronics and Telecommunication of Jiangxi Province
来源：
Chinese Physics B | 2020年 / 29卷 / 12期
基金：
中国国家自然科学基金;
关键词：
D O I：
暂无
中图分类号：
O413 [量子论]; O212.1 [一般数理统计];
学科分类号：
020208 ; 070103 ; 070201 ; 0714 ;
摘要：
In quantum information technologies, quantum weak measurement is beneficial for protecting coherence of systems.In order to further improve the protection effect of quantum weak measurement on coherence, we propose an optimization scheme of quantum Fisher information（QFI） protection in an open quantum system by combing no-knowledge quantum feedback control with quantum weak measurement. On the basis of solving the dynamic equations of a stochastic two-level quantum system under feedback control, we compare the effects of different feedback Hamiltonians on QFI and find that via no-knowledge quantum feedback, the observation operator σ;（or σ;and σ;） can protect QFI for a long time. Namely,no-knowledge quantum feedback can improve the estimation precision of feedback coefficient as well as that of detection coefficient.
引用
收藏
页码：175 / 183
页数：9
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