Improving entanglement concentration of Gaussian states by local displacements
arXiv:1107.2409 · doi:10.1103/PhysRevA.84.012335
Abstract
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.
6 pages, 5 figures, REVTeX4, accepted for publication in Phys. Rev. A
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- Displacement-enhanced entanglement distillation of single-mode-squeezed entangled states
- Displacement-enhanced continuous-variable entanglement concentration
- Optimal entanglement enhancing via conditional measurements
- Dynamically Reconfigurable Sources for Arbitrary Gaussian States in Integrated Photonics Circuits
- Enhancement in phase sensitivity in displacement-assisted SU(1,1) interferometer via photon recycling
- Entanglement Enhancement in Multimode Integrated Circuits