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.
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Wang, X., Tang, S. & Kuang, L. Nondestructive discrimination of Greenberger-Horne-Zeilinger-basis states via two-qubit parity detection. Sci. China Phys. Mech. Astron. 57, 1848–1853 (2014). https://doi.org/10.1007/s11433-014-5549-3
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DOI: https://doi.org/10.1007/s11433-014-5549-3