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.
- Publication:
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Frontiers of Physics
- Pub Date:
- October 2014
- DOI:
- 10.1007/s11467-014-0435-z
- Bibcode:
- 2014FrPhy...9..640Y
- Keywords:
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- cluster state;
- entanglement concentration;
- controlled-NOT gate