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Dynamics of quantum Fisher information in a two-level system coupled to multiple bosonic reservoirs |
| Wang Guo-You (王国友)a b, Guo You-Neng (郭有能)c, Zeng Ke (曾可)c |
a College of Science, Hunan University of Technology, Zhuzhou 412008, China;
b Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China;
c Department of Electronic and Communication Engineering, Changsha University, Changsha 410003, China |
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Abstract 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.
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Received: 12 April 2015
Revised: 26 May 2015
Accepted manuscript online:
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PACS:
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42.50.Dv
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(Quantum state engineering and measurements)
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| Fund: Project supported by the Hunan Provincial Innovation Foundation for Postgraduate, China (Grant No. CX2014B194) and the Scientific Research Foundation of Hunan Provincial Education Department, China (Grant No. 13C039). |
Corresponding Authors:
Guo You-Neng
E-mail: guoxuyan2007@163.com
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Cite this article:
Wang Guo-You (王国友), Guo You-Neng (郭有能), Zeng Ke (曾可) Dynamics of quantum Fisher information in a two-level system coupled to multiple bosonic reservoirs 2015 Chin. Phys. B 24 114201
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