于长水

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教授

博士生导师

硕士生导师

主要任职:物理学院党委书记

其他任职:无

性别:男

毕业院校:大连理工大学

学位:博士

所在单位:物理学院

学科:理论物理

办公地点:313

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Effects of the Coherence on the Parameter Estimation in a Quantum Metrology Scheme with Driving Fields

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论文类型:期刊论文

发表时间:2020-04-01

发表刊物:INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS

收录刊物:SCIE

卷号:59

期号:4

页面范围:993-1008

ISSN号:0020-7748

关键字:Quantum Fisher information; Quantum coherence; Quantum metrology

摘要:The effects of the initial-state coherence on the quantum Fisher information(QFI) is studied in a parameter estimation scheme where the endowed unknown phase is measured after a driven two-level probing atom interacts with its environment. It is shown that the relatively large initial-state coherence couldn't be necessary to achieve the large QFI, but it is necessary for the driving field to enhance the QFI. It is also found that the coherence plays its roles in the QFI through two paths. Generally, the QFI could lie at a low level in one path, but maintains a relatively high level in another path, even though the two paths correspond to the same initial-state coherence. This provides a way to achieve the large QFI with the less initial-state coherence.