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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Yan, X., Yu, YF. & Zhang, ZM. Entanglement concentration for a non-maximally entangled four-photon cluster state. Front. Phys. 9, 640–645 (2014). https://doi.org/10.1007/s11467-014-0435-z
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DOI: https://doi.org/10.1007/s11467-014-0435-z