Entanglement concentration for a non-maximally entangled four-photon cluster state |
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| Authors: | Xiang Yan Ya-Fei Yu Zhi-Ming Zhang |
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| Affiliation: | Laboratory of Nanophotonic Functional Materials and Devices (SIPSE), Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China |
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| Abstract: | We present a scheme for locally concentrating a non-maximally entangled four-photon cluster state into a maximally-entangled four-photon cluster state. This scheme has a high success probability. The controlled-NOT (CNOT) gate is a crucial ingredient in this scheme, and we use a nearly deterministic CNOT gate, which is similar with that first introduced by Nemoto et al. (Phys. Rev. Lett., 2004, 93: 250502). This CNOT gate has a simple structure and does not need the strong nonlinearity. |
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| Keywords: | cluster state entanglement concentration controlled-NOT gate |
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