文献类型：期刊文献

英文题名：Quantum metrology with a non-Markovian qubit system

作者：Huang, Jiang[1];Shi, Wen-Qing[1];Xie, Yu-Ping[1];Xu, Guo-Bao[1];Wu, Hui-Xian[1]

机构：[1]Guangdong Ocean Univ, Coll Elect & Informat Engn, Zhanjiang 524088, Peoples R China

年份：2018

卷号：27

期号：12

外文期刊名：CHINESE PHYSICS B

收录：SCI-EXPANDED(收录号：WOS:000454118400001)、、EI(收录号：20185206315368)、Scopus(收录号：2-s2.0-85059181660)、WOS

基金：Projects supported by the Natural Science Foundation of Guangdong Province, China (Grant No. 2015A030310354), the Science Foundation for Enhancing School with Innovation of Guangdong Ocean University (Grant Nos. GDOU2017052504 and GDOU2015050207), the Foundation of Excellent-YoungBackbone Teacher of Guangdong Ocean University (Grant No. HDYQ2017005), and the Fund of University Student Innovation and Entrepreneurship Team of Guangdong Ocean University (Grant No. CCTD201823).

语种：英文

外文关键词：quantum metrology; quantum Fisher information; time-convolutionless; parameter estimation

外文摘要：The dynamics of the quantum Fisher information (QFI) of phase parameter estimation in a non-Markovian dissipative qubit system is investigated within the structure of single and double Lorentzian spectra. We use the time-convolutionless method with fourth-order perturbation expansion to obtain the general forms of QFI for the qubit system in terms of a non-Markovian master equation. We find that the phase parameter estimation can be enhanced in our model within both single and double Lorentzian spectra. What is more, the detuning and spectral width are two significant factors affecting the enhancement of parameter-estimation precision.