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Entropic characterization of Separability in Gaussian states

We explore separability of bipartite divisions of mixed Gaussian states based on the positivity of the Abe-Rajagopal (AR) q-conditional entropy. The AR q-conditional entropic characterization provide more stringent restrictions on separability (in the limit q tending to infinity) than that obtained from the corresponding von Neumann conditional entropy (q = 1 case)--similar to the situation in finite dimensional states. Effectiveness of this approach, in relation to the results obtained by partial transpose criterion, is explicitly analyzed in three illustrative examples of two-mode Gaussian states of physical significance.

preprint2010arXivOpen access
Sudha ShenoyA. R. Usha DeviA. K. Rajagopal
quant-ph
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Open access3 authors1 topic
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Sudha ShenoyA. R. Usha DeviA. K. Rajagopal

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