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Optica Publishing Group
  • The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting
  • OSA Technical Digest (online) (Optica Publishing Group, 2013),
  • paper T5B.2
  • https://doi.org/10.1364/QIM.2013.T5B.2

Reliable Entanglement Detection Under Coarse-Grained Measurements

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Abstract

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.

© 2013 Optical Society of America

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