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作者： Yinghua Ji Qiang Ke Juju Hu College of Physics and Communication Electronics Jiangxi Normal UniversityNanchang 330022China Key Laboratory of Photoelectronics and Telecommunication of Jiangxi Province Nanchang 330022China

In quantum information technologies,quantum weak measurement is beneficial for protecting coherence of *** 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 *** 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 operatorσx(orσx andσz)can protect QFI for a long ***,no-knowledge quantum feedback can improve the estimation precision of feedback coefficient as well as that of detection coefficient.

关键词： no-knowledge quantum feedback real-time parameters estimation quantum Fisher information(QFI) open quantum system

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