中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5133-5138.doi: 10.1088/1674-1056/18/12/006

• GENERAL • 上一篇    下一篇

Probabilistic and robust preparation of a GHZ-type state via atomic ensembles and linear optics

陆小松, 史保森, 郭光灿   

  1. Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2008-12-26 修回日期:2009-01-13 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:
    Project supported by National Natural Science Foundation of China (Grant Nos 10674126 and 10874171), National Fundamental Research Program of China (Grant Nos 2006CB921900 and 2009CB929601), the Innovation Fund from CAS, Program for NCET, and Internationa

Probabilistic and robust preparation of a GHZ-type state via atomic ensembles and linear optics

Lu Xiao-Song(陆小松), Shi Bao-Sen(史保森)†, and Guo Guang-Can(郭光灿)   

  1. Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
  • Received:2008-12-26 Revised:2009-01-13 Online:2009-12-20 Published:2009-12-20
  • Supported by:
    Project supported by National Natural Science Foundation of China (Grant Nos 10674126 and 10874171), National Fundamental Research Program of China (Grant Nos 2006CB921900 and 2009CB929601), the Innovation Fund from CAS, Program for NCET, and Internationa

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摘要： This paper proposes two simple and robust schemes to generate an atomic-ensemble Greenberger--Horne--Zeilinger-type (GHZ-type) entangled state via linear optics and single photon detection. These schemes are based on two-photon Hong--Ou--Mandel-type interference, therefore they are insensitive to the phase fluctuation. This advantage will make the realizations of these two schemes easier. One scheme can scale efficiently with the number of ensembles because of the used quantum memory. Both schemes are also robust to the noise and within the reach of current technology.

Abstract: This paper proposes two simple and robust schemes to generate an atomic-ensemble Greenberger--Horne--Zeilinger-type (GHZ-type) entangled state via linear optics and single photon detection. These schemes are based on two-photon Hong--Ou--Mandel-type interference, therefore they are insensitive to the phase fluctuation. This advantage will make the realizations of these two schemes easier. One scheme can scale efficiently with the number of ensembles because of the used quantum memory. Both schemes are also robust to the noise and within the reach of current technology.

Key words: GHZ state, atomic ensemble, linear optics

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
02.50.Cw (Probability theory) 42.50.Dv (Quantum state engineering and measurements)