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Protecting Quantum Coherence and Quantum Fisher Information in Ohmic Reservoir

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Abstract

Quantum coherence(QC) and quantum Fisher information(QFI) are investigated for the atom in Jaynes-Cummings model coupling with the Ohmic reservoir at zero temperature when the total excitation number N = 1. We discuss in detail the influence of the atom-cavity coupling and the reservoir parameters on QC and QFI. The results show that QC and QFI of the atom can be effectively controlled by the atom-cavity coupling and the reservoir parameters. Namely, the larger atom-cavity coupling and the appropriate reservoir parameters can effectively protect QC and QFI. Moreover, QC can improve QFI. Last, we provide a physical explanation using the decoherence rate.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No 11374096) and the Doctoral Science Foundation of Hunan Normal University, China.

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    1. School of Electronic Information and Electrical Engineering, Changsha University, Changsha, 410003, People’s Republic of China

      Xiao-Zhi Liu

    2. 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, People’s Republic of China

      Dan Long, Hong-Mei Zou, Rongfang Liu & Jianhe Yang

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    Liu, XZ., Long, D., Zou, HM. et al. Protecting Quantum Coherence and Quantum Fisher Information in Ohmic Reservoir. Int J Theor Phys 59, 3600–3612 (2020). https://doi.org/10.1007/s10773-020-04620-z

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