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Phys. Rev. A 72, 052308 (2005) [3 pages]

Universal Greenberger-Horne-Zeilinger-state analyzer based on two-photon polarization parity detection

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Jun Qian1,2, Xun-Li Feng1,3, and Shang-Qing Gong4,1,*
1State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
3Department of Physics, Blk S12, National University of Singapore 2, Science Drive 3, Singapore 117542
4CCAST (World Laboratory), P. O. Box 8730, Beijing 100080, China

Received 22 July 2005; published 8 November 2005

We present a universal analyzer for the three-particle Greenberger-Horne-Zeilinger (GHZ) states with quantum nondemolition parity detectors and linear-optics elements. In our scheme, all of the three-photon GHZ states can be discriminated with nearly unity probability in the regime of weak nonlinearity feasible at the present state of the art experimentally. We also show that our scheme can be easily extended to the analysis of the multi-particle GHZ states.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.72.052308
DOI:
10.1103/PhysRevA.72.052308
PACS:
03.67.Mn, 03.65.Ud, 42.50.Dv

*Corresponding author. Email address: sqgong@mail.siom.ac.cn

 
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