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Preservation of Quantum Coherence for Gaussian-State Dynamics in a Non-Markovian Process |
| Jun Wen1,2, Guan-Qiang Li3,4** |
1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071
2University of the Chinese Academy of Sciences, Beijing 100049
3School of Arts and Sciences, Shaanxi University of Science and Technology, Xi'an 710021
4Department of Applied Physics and Key Laboratory for Quantum Information and Quantum Optoelectronic Devices of Shaanxi Province, Xi'an Jiaotong University, Xi'an 710049
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| Cite this article: |
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Jun Wen, Guan-Qiang Li 2018 Chin. Phys. Lett. 35 060301 |
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Abstract Coherence is a key resource in quantum information science. Exactly understanding and controlling the variation of coherence are vital for implementation in realistic quantum systems. Using $P$-representation of density matrix, we obtain the analytical solution of the master equation for the classical states in the non-Markovian process and investigate the coherent dynamics of Gaussian states. It is found that quantum coherence can be preserved in such a process if the coupling strength between system and environment exceeds a threshold value. We also discuss the characteristic function of the Gaussian states in the non-Markovian process, which provides an inevitable bridge for the control and operation of quantum coherence.
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Received: 08 December 2017
Published: 19 May 2018
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| PACS: |
03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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03.65.Xp
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(Tunneling, traversal time, quantum Zeno dynamics)
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42.25.Kb
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(Coherence)
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42.50.Ar
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11405100, 11404377 and 11674360, the Natural Science Basic Research Plan of Shaanxi Province of China under Grant No 2015JM1032, and the Doctoral Research Fund of Shaanxi University of Science and Technology of China under Grant No 2018BJ-02. |
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