Complete N -Qubit Greenberger—Horne—Zeilinger States Analysis Assisted by Frequency Degree of Freedom
Zhi Zeng, Chun Wang, Xihan Li · Communications in Theoretical Physics · 2014
We present an efficient and simple protocol to unambiguously distinguish 2 N mutual orthogonal N-qubit Greenberger—Horne—Zeilinger states in polarization degree of freedom assisted by the frequency one. This scheme is based on N single photon Bell state measurements, which can be implemented non-locally. The success probability is 100% in principle and our scheme is feasible with current technology. All the advantages make our protocol meaningful and practical in quantum information processing.