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Optics Communications

Complete N-photon Greenberger–Horne–Zeilinger-state analyzer and its applications to quantum communication

Qi Guo, Liu‐Yong Cheng, Hong‐Fu Wang, Shou Zhang, Kyu-Hwang Yeon

Published Nov 10, 2011• 10 citations
Publisher
DOI
10.1016/j.optcom.2011.10.075

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We present an efficient scheme for the complete analysis of hyperentangled Greenberger–Horne–Zeilinger (GHZ) state in polarization and time-bin degrees of freedom with two steps. Firstly, the polarization GHZ state is distinguished completely and nondestructively, resorting to the controlled phase flip (CPF) gate constructed by the cavity-assisted interaction. Subsequently, the time-bin GHZ state is analyzed by using the preserved polarization entanglement. With the help of CPF gate and self-assisted mechanism, our scheme can be directly generalized to the complete N-photon hyperentangled GHZ state analysis, and it may have potential applications in the hyperentanglement-based quantum communication.