Optimality of Gaussian Discord
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Optimality of Gaussian Discord.pdf
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Author(s)
Pirandola, Stefano
Spedalieri, Gaetana
Braunstein, Samuel L.
Cerf, Nicolas J.
Lloyd, Seth
Date Issued
October 2014
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Pirandola, Stefano, Gaetana Spedalieri, Samuel L. Braunstein, Nicolas J. Cerf, and Seth Lloyd. “Optimality of Gaussian Discord.” Physical Review Letters 113, no. 14 (October 3, 2014). ©2014 American Physical Society
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.113.140405
