文献类型：期刊文献

英文题名：Enhancing the Precision of Parameter Estimation in Band Gap

作者：Huang, J.[1];Zhan, Q.[1];Liu, Z. K.[1]

机构：[1]Guangdong Ocean Univ, Phys & Photoelect Sci Dept, Zhanjiang 524088, Peoples R China

年份：2016

卷号：55

期号：9

起止页码：3973

外文期刊名：INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS

收录：SCI-EXPANDED(收录号：WOS:000380724500017)、、Scopus(收录号：2-s2.0-84964528966)、WOS

基金：Supported by the natural science foundation of Guangdong province, China(Grants No. 2015A030310354) and the college students' scientific and technological innovation of Guangdong Ocean University.

语种：英文

外文关键词：Quantum Fisher information; Pseudomode; Parameter estimation

外文摘要：Recently, the dynamics of quantum Fisher information(QFI) in various environment are investigated and many kinds of schemes to overcome the drawback of decoherence are designed. Here we propose the pseudomode method to enhance the phase parameter precision of optimal quantum estimation of a qubit coupled to a non-Markovian structured environment. We find that the QFI can be enhanced in the weak-coupling regime with non-perfect band gap and can be trapped permanently with a large value in the perfect band gap. The effects of qubit-pseudomode detuning and the spectrum of reservoir are discussed, a reasonable physical explanation is given, too.