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Quantum versus classical correlations in Gaussian states.

Abstract:

Quantum discord, a measure of genuinely quantum correlations, is generalized to continuous variable systems. For all two-mode Gaussian states, we calculate analytically the quantum discord and a related measure of classical correlations, solving an optimization over all Gaussian measurements. Almost all two-mode Gaussian states are shown to have quantum correlations, while for separable states, the discord is smaller than unity. For a given amount of entanglement, it admits tight upper and lo...

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Publication status:
Published

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Institution:
University of Oxford
Department:
Oxford, MPLS, Physics
Journal:
Physical review letters
Volume:
105
Issue:
3
Pages:
030501
Publication date:
2010-07-05
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
URN:
uuid:08033ae7-dcbf-4e01-aed2-59decf667c72
Source identifiers:
158882
Local pid:
pubs:158882
Language:
English

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