中国物理B ›› 2009, Vol. 18 ›› Issue (9): 3677-3686.doi: 10.1088/1674-1056/18/9/012

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Tunable thermal entanglement in an effective spin-star system using coupled microcavities

安钧鸿1, 冯芒2, 杨万里3, 魏华3   

  1. (1)Department of Modern Physics, Lanzhou University, Lanzhou 730000, China;Department of Physics, National University of Singapore, 2 Science Drive 3, 117542, Singapore; (2)State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China; (3)State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;Graduate School of the Chinese Academy of Sciences, Bejing 100049, China
  • 收稿日期:2008-11-17 修回日期:2008-12-03 出版日期:2009-09-20 发布日期:2009-09-20
  • 基金资助:
    Project supported by National Natural Science Foundation of China (Grant Nos 10774163, 10774042 and 10604025), and the National Fundamental Research Program of China (Grants Nos 2005CB724502 and 2006CB921203).

Tunable thermal entanglement in an effective spin-star system using coupled microcavities

Yang Wan-Li(杨万里)a)b), Wei Hua(魏华)a)b), Feng Mang(冯芒)a)†, and An Jun-Hong(安钧鸿)c)d)   

  1. a State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China; b Graduate School of the Chinese Academy of Sciences, Bejing 100049, China; c Department of Modern Physics, Lanzhou University, Lanzhou 730000, China; d Department of Physics, National University of Singapore, 2 Science Drive 3, 117542, Singapore
  • Received:2008-11-17 Revised:2008-12-03 Online:2009-09-20 Published:2009-09-20
  • Supported by:
    Project supported by National Natural Science Foundation of China (Grant Nos 10774163, 10774042 and 10604025), and the National Fundamental Research Program of China (Grants Nos 2005CB724502 and 2006CB921203).

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摘要： We theoretically explore the possibility of realizing controllable thermal entanglement of effective spins in a four-qubit anisotropic Heisenberg XXZ coupling spin-star system constructed by coupled microcavities. We analyse the dependence of thermal entanglement in this system on temperature, inhomogeneity of the magnetic field, and anisotropy, which can be readily tuned via the external laser fields. The peculiar characteristic and the full controllability of the thermal entanglement are demonstrated to be useful for quantum information processing.

Abstract: We theoretically explore the possibility of realizing controllable thermal entanglement of effective spins in a four-qubit anisotropic Heisenberg XXZ coupling spin-star system constructed by coupled microcavities. We analyse the dependence of thermal entanglement in this system on temperature, inhomogeneity of the magnetic field, and anisotropy, which can be readily tuned via the external laser fields. The peculiar characteristic and the full controllability of the thermal entanglement are demonstrated to be useful for quantum information processing.

Key words: thermal entanglement, Heisenberg model, cavity QED

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
03.67.Lx (Quantum computation architectures and implementations) 42.50.Dv (Quantum state engineering and measurements) 42.50.Pq (Cavity quantum electrodynamics; micromasers) 75.10.Jm (Quantized spin models, including quantum spin frustration)