2012/10/31 by D. S. Tasca, Łukasz Rudnicki, R. M. Gomes +2 · 2 citations
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.110.210502
published as Physical Review Letters 110, 210502 (2013) · Dedicated to Iwo Bialynicki-Birula on his 80th birthday, who inspired much of this work
arxiv created 2013/06/17 · arxiv updated 2013/06/18
We derive reliable entanglement witnesses for coarse--grained measurements on continuous variable systems. These witnesses never return a "false positive" for identification of entanglement, under any degree of coarse graining. We show that, even in the case of Gaussian states, entanglement witnesses based on the Shannon entropy can outperform those based on variances. We apply our results to experimental identification of spatial entanglement of photon pairs.