中国物理B ›› 2008, Vol. 17 ›› Issue (2): 435-439.doi: 10.1088/1674-1056/17/2/015

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Factors influencing entanglement of two excitons in a coupled exciton--photon system

向少华1, 宋克慧1, 杨 雄2   

  1. (1)Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008, China ;Research Institute of Information Science, Huaihua University, Huaihua 418008, China; (2)Department of Physics, Hunan Normal University, Changsha 410081, China
  • 收稿日期:2007-08-17 修回日期:2007-08-13 出版日期:2008-02-20 发布日期:2008-02-20
  • 基金资助:
    Project supported by the Scientific Research Fund of Education Bureau of Hunan Province (Grant No 05C696).

Factors influencing entanglement of two excitons in a coupled exciton--photon system

Yang Xiong(杨雄)a), Xiang Shao-Hua(向少华)b)c), and Song Ke-Hui(宋克慧)b)c)†   

  1. a Department of Physics, Hunan Normal University, Changsha 410081, China; b Department of Physics and Electronic Information Science, Huaihua University, Huaihua 418008, China; c Research Institute of Information Science, Huaihua University, Huaihua 418008, China
  • Received:2007-08-17 Revised:2007-08-13 Online:2008-02-20 Published:2008-02-20
  • Supported by:
    Project supported by the Scientific Research Fund of Education Bureau of Hunan Province (Grant No 05C696).

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摘要： The relation between the excitonic purity and the concurrence in a system of two coupled large semiconduction quantum dots mediated by a single-mode cavity field is investigated by using linear entropy theory. The results show the difference in describing two modes of excitonic entanglement between linear entropy and concurrence. The relation between nonclassical property of cavity field and the entanglement degree of excitons is also discussed. The results show that two modes of exciton can reach maximal entanglement when the cavity exhibits an antibunching effect.

关键词: quantum dot, exciton, linear entropy, antibunching effect

Abstract: The relation between the excitonic purity and the concurrence in a system of two coupled large semiconduction quantum dots mediated by a single-mode cavity field is investigated by using linear entropy theory. The results show the difference in describing two modes of excitonic entanglement between linear entropy and concurrence. The relation between nonclassical property of cavity field and the entanglement degree of excitons is also discussed. The results show that two modes of exciton can reach maximal entanglement when the cavity exhibits an antibunching effect.

Key words: quantum dot, exciton, linear entropy, antibunching effect

中图分类号:  (Exciton-mediated interactions)

  • 71.35.Gg
73.21.La (Quantum dots)