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Sudden Transition in Quantum Discord Dynamics: Role of Three-Site Interaction |
| TIAN Li-Jun1**, ZHANG Cai-Yun1, QIN Li-Guo2 |
1Department of Physics, Shanghai University, Shanghai 200444
2Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210
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| Cite this article: |
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TIAN Li-Jun, ZHANG Cai-Yun, QIN Li-Guo 2013 Chin. Phys. Lett. 30 050303 |
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Abstract We investigate the dynamics of quantum discord for a two-qubit system coupled to a spin chain with three-site interaction in the weak-coupling region. For the case of the initial two-qubit pure state, the decay of quantum discord can be delayed in a special interval of the three-site coupling strength. In the absence of the transverse field, with the increase of three-site interaction, quantum discord tends to be stabler. For the case of the initial mixed state, the increase of quantum discord is delayed in the special interval of three-site interaction. In addition, a sudden transition between classical and quantum decoherence is also observed, with the transition time determined by the three-site interaction and degree of anisotropy.
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Received: 04 January 2013
Published: 31 May 2013
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| PACS: |
03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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03.65.Ud
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(Entanglement and quantum nonlocality)
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75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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