Nondestructive Greenberger-Horne-Zeilinger-state analyzer

Authors:
Xin-Wen Wang;Deng-Yu Zhang;Shi-Qing Tang;Li-Jun Xie
Affiliations:
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education and Department of Physics, Hunan Normal University, Changsha, People's Republic of China 410081 an ...;Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang, People's Republic of China 421008;Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang, People's Republic of China 421008;Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang, People's Republic of China 421008
Venue:
Quantum Information Processing
Year:
2013

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Abstract

We propose a method to construct a nondestructive n-qubit Greenberger--- Horne---Zeilinger (GHZ)-state analyzer. The method is applied to any systems in which two-qubit parity gates, controlled-phase gates, or controlled-NOT gates can be realized. We also present a simplified two-photon parity gate with which a nondestructive n-photon GHZ-state analyzer could be largely simplified. The nondestructive GHZ-state analyzer is expected to find useful applications for economical quantum-information processing.