Mixed state localizable entanglement for continuous variables

Details Mixed state localizable entanglement for continuous variables Mixed state localizable entanglement for continuous variables

2008-05-20

arxiv.org/abs/0805.3088v1

Phys. Rev. A 78, 012359 (2008).

Physics

Quantum Physics

11 pages, 3 figures

Scientific paper

10.1103/PhysRevA.78.012359

We investigate localization of entanglement of multipartite mixed Gaussian states into a pair of modes by local Gaussian measurements on the remaining modes and classical communication. We provide a detailed proof that for arbitrary symmetric Gaussian state maximum entanglement can be localized by homodyne detection of either amplitude or phase quadrature on each mode. We then consider arbitrary mixed three-mode Gaussian states and show that the optimal Gaussian measurement on one mode yielding maximum entanglement among the other two modes can be determined by calculating roots of a high-order polynomial. Finally, we discuss localization of entanglement with single-photon detection.

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