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Frozen Quantum Coherence for a Central Two-Qubit System in a Spin-Chain Environment |
| Yang Yang1**, An-Min Wang2, Lian-Zhen Cao1, Jia-Qiang Zhao1, Huai-Xin Lu1 |
1Shandong Provincial Key Laboratory of Multi-Photon Entanglement and Manipulation, Department of Physics and Optoelectronic Engineering, Weifang University, Weifang 261061
2Department of Modern Physics, University of Science and Technology of China, Hefei 230026
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| Cite this article: |
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Yang Yang, An-Min Wang, Lian-Zhen Cao et al 2018 Chin. Phys. Lett. 35 080301 |
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Abstract We investigate the dynamics of coherence for a central two-qubit system coupled to an $XY$ spin chain with the Dzyaloshinsky–Moriya interaction. It is found that a sudden transition of coherence exists near the critical point in the weak-coupling case, and an oscillatory envelope appears in the strong-coupling case. In both cases the freezing phenomenon of coherence can be found.
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Received: 16 April 2018
Published: 15 July 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.Ta
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(Foundations of quantum mechanics; measurement theory)
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03.65.Ud
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(Entanglement and quantum nonlocality)
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| Fund: Supported by the National Natural Science Foundation of China under Grant No 11404246, and the Shandong Provincial Natural Science Foundation under Grant No ZR2017MF040. |
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