Improving entanglement concentration of Gaussian states by local displacements

Details Improving entanglement concentration of Gaussian states by local displacements Improving entanglement concentration of Gaussian states by local displacements

2011-07-12

arxiv.org/abs/1107.2409v1

Physics

Quantum Physics

6 pages, 5 figures, REVTeX4, accepted for publication in Phys. Rev. A

Scientific paper

We investigate entanglement concentration of continuous-variable Gaussian states by local single-photon subtractions combined with local Gaussian operations. We first analyze the local squeezing-enhanced entanglement concentration protocol proposed very recently by Zhang and van Loock [e-print: arXiv:1103.4500 (2011)] and discuss the mechanism by which local squeezing before photon subtraction helps to increase the entanglement of the output state of the protocol. We next show that a similar entanglement improvement can be achieved by using local coherent displacements instead of single-mode squeezing.

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