The entangling power of passive optical elements

Details The entangling power of passive optical elements The entangling power of passive optical elements

2002-06-24

arxiv.org/abs/quant-ph/0206171v2

Phys. Rev. Lett. 90, 047904 (2003)

Physics

Quantum Physics

4 pages, 1 figure, replaced with published version

Scientific paper

10.1103/PhysRevLett.90.047904

We investigate the entangling capability of passive optical elements, both qualitatively and quantitatively. We present a general necessary and sufficient condition for the possibility of creating distillable entanglement in an arbitrary multi-mode Gaussian state with the help of passive optical elements, thereby establishing a general connection between squeezing and the entanglement that is attainable by non-squeezing operations. Special attention is devoted to general two-mode Gaussian states, for which we provide the optimal entangling procedure, present an explicit formula for the attainable degree of entanglement measured in terms of the logarithmic negativity, and discuss several practically important special cases.

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