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Science China Physics Mechanics and Astronomy

Nondestructive discrimination of Greenberger-Horne-Zeilinger-basis states via two-qubit parity detection

Xin-Wen Wang, Shi-Qing Tang, Le‐Man Kuang

Published Jun 26, 2014• 1 citation
Publisher
DOI
10.1007/s11433-014-5549-3

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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.
We propose an efficient scheme to build an arbitrary multipartite Greenberger-Horne-Zeilinger state and discriminate all the universal Greenberger-Horne-Zeilinger states using parity measurement based on dipole-induced transparency in a cavity-waveguide system. A prominent advantage is that initial entangled states remain after nondetective identification and they can be used for successive tasks. We analyze the performance and possible errors of the required single-qubit rotations and emphasize that the scheme is reliable and can satisfy the current experimental technology.