Protecting quantum Fisher information in curved space-time

被引：18
|
作者：
Huang, Zhiming [1 ]
机构：
[1] Wuyi Univ, Sch Econ & Management, Jiangmen 529020, Peoples R China
来源：
EUROPEAN PHYSICAL JOURNAL PLUS | 2018年 / 133卷 / 03期
关键词：
MEASUREMENT REVERSAL; WEAK MEASUREMENT; DYNAMICAL SEMIGROUPS; NOISY ENVIRONMENT; ENTANGLEMENT; COHERENCE; DISCORD; QUBIT;
D O I：
10.1140/epjp/i2018-11936-9
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In this work, we investigate the quantum Fisher information (QFI) dynamics of a two-level atom interacting with quantized conformally coupled massless scalar fields in de Sitter-invariant vacuum. We first derive the master equation that governs its evolution. It is found that the QFI decays with evolution time. Furthermore, we propose two schemes to protect QFI by employing prior weak measurement (WM) and post measurement reversal (MR). We find that the first scheme can not always protect QFI and the second scheme has prominent advantage over the first scheme.
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页数：8
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