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Protection of Quantum Correlations of a Two-Atom System in Dissipative Environments via Quantum-Jump-Based Feedback Control

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Abstract

Quantum correlations of two atoms independently coupled to their own environments under local quantum-jump-based feedback control are investigated. We analyze the dynamics of geometric measure of quantum discord (GMQD) and entanglement. Our results show that the protection of GMQD and entanglement strongly depends on quantum feedback parameters, initial atomic states and classical driving. We find that under the condition of designing proper quantum-jump-based feedback parameters, GMQD and entanglement can be protected. But, for a specific initial state, the evolution of entanglement is independent of the feedback parameter, while the evolution of GMQD relies on the chosen feedback parameter. The influence of classical driving on the evolution of quantum correlations is also explored. The results show that under appropriate feedback control, classical driving can protect GMQD for a period of time in the initial stage, but not for entanglement.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant Nos.11374096).

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Authors and Affiliations

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

    Min Yu & Mao-Fa Fang

  2. Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha, 410081, China

    Min Yu & Mao-Fa Fang

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  1. Min Yu
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  2. Mao-Fa Fang
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Correspondence to Mao-Fa Fang.

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Yu, M., Fang, MF. Protection of Quantum Correlations of a Two-Atom System in Dissipative Environments via Quantum-Jump-Based Feedback Control. Int J Theor Phys 56, 1937–1947 (2017). https://doi.org/10.1007/s10773-017-3339-1

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  • DOI: https://doi.org/10.1007/s10773-017-3339-1

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