中国物理B ›› 2009, Vol. 18 ›› Issue (2): 411-417.doi: 10.1088/1674-1056/18/2/006

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Effects of Dzyaloshinski--Moriya interaction and intrinsic decoherence on teleportation via a two-qubit Heisenberg XYZ model

胡小勉, 刘金明   

  1. State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China
  • 收稿日期:2008-07-06 修回日期:2008-08-15 出版日期:2009-02-20 发布日期:2009-02-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 60708003, 60578050 and 10434060), the National Basic Research Program of China (Grant No 2006CB921604), the Shanghai Science and Technology Committee (Grant No 07JC14017), an

Effects of Dzyaloshinski--Moriya interaction and intrinsic decoherence on teleportation via a two-qubit Heisenberg XYZ model

Hu Xiao-Mian(胡小勉) and Liu Jin-Ming(刘金明)†   

  1. State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China
  • Received:2008-07-06 Revised:2008-08-15 Online:2009-02-20 Published:2009-02-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 60708003, 60578050 and 10434060), the National Basic Research Program of China (Grant No 2006CB921604), the Shanghai Science and Technology Committee (Grant No 07JC14017), an

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摘要： Quantum teleportation via the entangled channel composed of a two-qubit Heisenberg XYZ model with Dzyaloshinski--Moriya (DM) interaction in the presence of intrinsic decoherence has been investigated. We find that the initial state of the channel plays an important role in the teleported state and the average fidelity of teleportation. When the initial channel is in the state |ψ 1(0)>=a|00> +b|11>, the average fidelity is equal to 1/3 constantly, which is independent of the DM interaction and the intrinsic decoherence effect. But when the channel is initially in the state |ψ 2(0)> =c|01> +d|10>, the average fidelity is always larger than 2/3. Moreover, under a certain condition, the average fidelity can be enhanced by adjusting the DM interaction, and the intrinsic decoherence leads to a suppression of the fluctuation of the average fidelity.

关键词: Heisenberg model, intrinsic decoherence, DM interaction, average fidelity

Abstract: Quantum teleportation via the entangled channel composed of a two-qubit Heisenberg XYZ model with Dzyaloshinski--Moriya (DM) interaction in the presence of intrinsic decoherence has been investigated. We find that the initial state of the channel plays an important role in the teleported state and the average fidelity of teleportation. When the initial channel is in the state $|\psi_1(0)\rangle=a|00\rangle+b|11\rangle$, the average fidelity is equal to 1/3 constantly, which is independent of the DM interaction and the intrinsic decoherence effect. But when the channel is initially in the state $|\psi_2(0)\rangle =c|01\rangle +d|10\rangle$, the average fidelity is always larger than 2/3. Moreover, under a certain condition, the average fidelity can be enhanced by adjusting the DM interaction, and the intrinsic decoherence leads to a suppression of the fluctuation of the average fidelity.

Key words: Heisenberg model, intrinsic decoherence, DM interaction, average fidelity

中图分类号:  (Quantum computation architectures and implementations)

  • 03.67.Lx
03.65.Ud (Entanglement and quantum nonlocality) 03.67.Mn (Entanglement measures, witnesses, and other characterizations) 75.10.Jm (Quantized spin models, including quantum spin frustration) 03.65.Yz (Decoherence; open systems; quantum statistical methods)