Experimental Investigation of the Evolution of Gaussian Quantum Discord in an Open System

Lars S. Madsen, Adriano Berni, Mikael Lassen, Ulrik L. Andersen

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Abstract

Gaussian quantum discord is a measure of quantum correlations in Gaussian systems. Using Gaussian discord, we quantify the quantum correlations of a bipartite entangled state and a separable two-mode mixture of coherent states. We experimentally analyze the effect of noise addition and dissipation on Gaussian discord and show that the former noise degrades the discord, while the latter noise for some states leads to an increase of the discord. In particular, we experimentally demonstrate the near death of discord by noisy evolution and its revival through dissipation.
Original languageEnglish
JournalPhysical Review Letters
Volume109
Issue number3
Pages (from-to)030402
ISSN0031-9007
DOIs
Publication statusPublished - 2012

Bibliographical note

2012 American Physical Society

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