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Optimality of Gaussian Discord

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JournalPhysical Review Letters
DatePublished - 3 Oct 2014
Issue number14
Volume113
Number of pages5
Original languageEnglish

Abstract

In this Letter we exploit the recently solved conjecture on the bosonic minimum output entropy to show the optimality of Gaussian discord, so that the computation of quantum discord for bipartite Gaussian states can be restricted to local Gaussian measurements. We prove such optimality for a large family of Gaussian states, including all two-mode squeezed thermal states, which are the most typical Gaussian states realized in experiments. Our family also includes other types of Gaussian states and spans their entire set in a suitable limit where they become Choi matrices of Gaussian channels. As a result, we completely characterize the quantum correlations possessed by some of the most important bosonic states in quantum optics and quantum information

Bibliographical note

ReVTEX. 4 pages + 4 pages (Supplemental Material). Comments are welcome

    Research areas

  • quant-ph, cond-mat.stat-mech, math-ph, math.MP, physics.optics

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