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Dynamics and Protection of the Relative Entropy of Coherence via Additional Non-interacting Qubits

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Abstract

We analytically study the dynamical behavior of the quantum coherence of a single-qubit coupled to a bosonic reservoir at zero temperature via plugging additional non-interacting qubits into the reservoir in both Markovian and non-Markovian regimes. The influences of detuning, memory effects and number of additional qubits on the dynamics of the quantum coherence are considered. It is found that, via increasing the number of the additional qubits in the reservoir, the quantum coherence can be preserved. Moreover, the method based on the combination of larger effective detuning, the stronger non-Markovian effects and the more number of additional qubits, can more effectively prevent the loss of the quantum coherence.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Grant No. 11275064), the Natural Science Foundation of Hunan Province (Grant No. 2016JJ2045), Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education (QSQC1411) and Hunan Provincial Department of Education Natural Science Foundation General Project (Grant No. 16C0469).

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Authors and Affiliations

  1. College of Science, Hunan University of Technology, Zhuzhou, Hunan, 412007, China

    Guo-you Wang

  2. Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha, Hunan, 410081, China

    Guo-you Wang & Deng-kui Jiang

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  1. Guo-you Wang
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  2. Deng-kui Jiang
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Correspondence to Guo-you Wang.

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Wang, Gy., Jiang, Dk. Dynamics and Protection of the Relative Entropy of Coherence via Additional Non-interacting Qubits. Int J Theor Phys 58, 333–344 (2019). https://doi.org/10.1007/s10773-018-3934-9

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  • DOI: https://doi.org/10.1007/s10773-018-3934-9

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