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Gaussian Quantum Discord

descriptionPublicationkeyboard_double_arrow_right Article , Preprint 07 Jul 2010Embargo end date: 01 Jan 2010 Italy English Publisher:American Physical Society (APS)Journal:Physical Review Letters, volume 105 (issn: 0031-9007, eissn: 1079-7114, Copyright policy )
Authors: P. Giorda; M. Paris;

doi: 10.1103/physrevlett.105.020503 , 10.48550/arxiv.1003.3207

pmid: 20867693

arXiv: http://arxiv.org/abs/1003.3207

handle: 2434/148334

Gaussian Quantum Discord

Abstract

We extend the quantum discord to continuous variable systems and evaluate Gaussian quantum discord C(��) for bipartite Gaussian states. In particular, for squeezed thermal states (STS), we explicitly maximize the extractable information over Gaussian measurements: C(��) is minimized by a generalized measurement rather than a projective one. Almost all STS have nonzero Gaussian discord: they may be either separable or entangled if the discord is below the threshold C(��)=1, whereas they are all entangled above the threshold. We elucidate the general role of state parameters in determining the discord and discuss its evolution in noisy channels.

4 pages, 2 figures, new version, typos fixed

Country
Italy
Related Organizations
Keywords

Quantum Physics, FOS: Physical sciences, Quantum Physics (quant-ph)

  • BIP!
    Impact byBIP!
    citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    		 440
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    		 Top 1%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
440
Top 1%
Top 1%
Top 0.1%
Green
bronze