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Modulating quantum Fisher information of qubit in dissipative cavity by coupling strength |
| Danping Lin(林丹萍), Yu Liu(刘禹), Hong-Mei Zou(邹红梅) |
| Synergetic Innovation Center for Quantum Effects and Application, Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, School of Physics and Electronics, Hunan Normal University, Changsha 410081, China |
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Abstract By using the non-Markovian master equation, we investigate the effect of the cavity and the environment on the quantum Fisher information (QFI) of an atom qubit system in a dissipation cavity. We obtain the formulae of QFI for two different initial states and analyze the effect of the atom-cavity coupling and the cavity-reservoir coupling on the QFI. The results show that the dynamic behavior of the QFI is obviously dependent on the initial atomic states, the atom-cavity coupling, and the cavity-reservoir coupling. The stronger the atom-cavity coupling, the quicker the QFI oscillates, and the slower the QFI decreases. In particular, the QFI will tend to be a stable value rather than zero if the atom-cavity coupling is large enough. On the other hand, the smaller the cavity-reservoir coupling, the stronger the non-Markovian effect, and the slower the QFI decays. In other words, choosing the best parameter can improve the accuracy of the parameter estimation. In addition, the physical explanation of the dynamic behavior of the QFI is given by means of the QFI flow.
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Received: 30 May 2018
Revised: 31 August 2018
Accepted manuscript online:
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PACS:
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03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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03.65.Ta
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(Foundations of quantum mechanics; measurement theory)
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03.67.-a
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(Quantum information)
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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 Scientific Research Project of Hunan Provincial Education Department, China (Grant No. 16C0949), Hunan Provincial Innovation Foundation for Postgraduate, China (Grant No. CX2017B177), the National Natural Science Foundation of China (Grant No. 11374096), and the Doctoral Science Foundation of Hunan Normal University, China. |
Corresponding Authors:
Hong-Mei Zou
E-mail: zhmzc1997@hunnu.edu.cn
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Cite this article:
Danping Lin(林丹萍), Yu Liu(刘禹), Hong-Mei Zou(邹红梅) Modulating quantum Fisher information of qubit in dissipative cavity by coupling strength 2018 Chin. Phys. B 27 110303
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