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Chin. Phys. B, 2009, Vol. 18(12): 5133-5138    DOI: 10.1088/1674-1056/18/12/006
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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)
Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
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.
Keywords:  GHZ state      atomic ensemble      linear optics  
Received:  26 December 2008      Revised:  13 January 2009      Accepted manuscript online: 
PACS:  03.65.Ud (Entanglement and quantum nonlocality)  
  02.50.Cw (Probability theory)  
  42.50.Dv (Quantum state engineering and measurements)  
Fund: 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

Cite this article: 

Lu Xiao-Song(陆小松), Shi Bao-Sen(史保森), and Guo Guang-Can(郭光灿) Probabilistic and robust preparation of a GHZ-type state via atomic ensembles and linear optics 2009 Chin. Phys. B 18 5133

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