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Nondestructive discrimination of Greenberger-Horne-Zeilinger-basis states via two-qubit parity detection |
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| Authors: | XinWen Wang ShiQing Tang LeMan Kuang |
| Affiliation: | 1. Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang, 421002, China 2. Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha, 410081, China |
| Abstract: | We propose new methods to construct universal Greenberger-Horne-Zeilinger (GHZ)-state analyzers without destroying the qubits by using two-qubit parity gates. The idea can be applied to any physical systems where the two-qubit parity gate can be realized. We also investigate the feasibility of nondestructively distinguishing the GHZ-basis states for photonic qubits with such an idea. The nondestructive GHZ-state analyzers can act as generators of GHZ entangled states and are expected to find useful applications for resource-saving quantum information processing. |
| Keywords: | nondestructive GHZ-state analyzer two-qubit parity gate photon |
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