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
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
摘要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.
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.
(Quantized spin models, including quantum spin frustration)
引用本文:
XI Xiao-Qiang;LIU Wu-Ming. Generation of Long-Distance Entanglement in Spin System[J]. 中国物理快报, 2008, 25(7): 2346-2349.
XI Xiao-Qiang, LIU Wu-Ming. Generation of Long-Distance Entanglement in Spin System. Chin. Phys. Lett., 2008, 25(7): 2346-2349.
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2008, Vol. 25 
