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Generation of Long-Distance Entanglement in Spin System |
| XI Xiao-Qiang1, LIU Wu-Ming2 |
| 1Department of Applied Mathematics and Physics, Xi'an Institute of Posts and Telecommunications, Xi'an 7100612Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080 |
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| Cite this article: |
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XI Xiao-Qiang, LIU Wu-Ming 2008 Chin. Phys. Lett. 25 2346-2349 |
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Abstract We propose two schemes to produce long-distance entanglement in a spin chain. The first is based on a controllable interaction system, one starts from an entangled kernel and adds weaken interaction spins to the boundary sites step by step, then the entanglement will be extended longer and longer and its value is equal to that of its kernel. The second is based on a uniform interaction (J) system with a bulk magnetic field (B) that is absent for the boundary qubits, as long as B/J>5, one can obtain near perfect long distance entanglement. Ultra-low temperature is needed in both schemes.
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| Keywords:
03.65.Ud
05.50.+q
75.10.Jm
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Received: 13 March 2008
Published: 26 June 2008
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| PACS: |
03.65.Ud
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(Entanglement and quantum nonlocality)
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05.50.+q
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(Lattice theory and statistics)
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75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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