Dynamics of quantum Fisher information in a two-level system coupled to multiple bosonic reservoirs

• 作者: 曾可 王国友 郭有能
• 来源期刊: 中国物理B（英文版）
• 关键词: quantum Fisher information parameter estimation decay rate
• 年，卷（期）: 2015,（11）
• 页码范围: 114201-1-114201-5
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/24/11/114201

摘要

We consider the optimal parameter estimation for a two-level system coupled to multiple bosonic reservoirs. By using quantum Fisher information (QFI), we investigate the effect of the Markovian reservoirs’ number N on QFI in both weak and strong coupling regimes for a two-level system surrounded by N zero-temperature reservoirs of field modes initially in the vacua. The results show that the dynamics of QFI non-monotonically decays to zero with revival oscillations at some time in the weak coupling regime depending on the reservoirs’ parameters. Furthermore, we also present the relations between the QFI flow, the flows of energy and information, and the sign of the decay rate to gain insight into the physical processes characterizing the dynamics.