Entanglement concentration for a non-maximally entangled four-photon cluster state

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.

Graphical abstract

Keywords

cluster state / entanglement concentration / controlled-NOT gate

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Higher Education Press and Springer-Verlag Berlin Heidelberg