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Nondestructive N-atom Greenberger–Horne–Zeilinger state analyzer via the cavity input–output process

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Abstract

We propose a deterministic scheme to realize N-atom Greenberger–Horne–Zeilinger (GHZ) state analyzer based on the cavity input–output process. In the scheme, we construct a two-qubit parity analyzer and a GHZ-state phase analyzer and show that all the N-atom GHZ states can be completely identified in a nondestructive way by combining these two kinds of analyzers. The fidelities of our analyzers are also calculated, which show that our scheme has a high performance in theory. The scheme opens promising perspectives for achieving efficient large-scale quantum communication and quantum information processing networks.

© 2012 Optical Society of America

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