No-local-broadcasting theorem for multipartite quantum correlations

Marco Piani; Paweł Horodecki; Ryszard Horodecki

No-local-broadcasting theorem for multipartite quantum correlations

Abstract

We prove that the correlations present in a multipartite quantum state have an operational quantum character even if the state is unentangled, as long as it does not simply encode a multipartite classical probability distribution. Said quantumness is revealed by the new task of local broadcasting, i.e., of locally sharing preestablished correlations, which is feasible if and only if correlations are stricly classical. Our operational approach leads to natural definitions of measures for quantumness of correlations. It also reproduces the standard no-broadcasting theorem as a special case.

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Category:: Articles
Type:: artykuł w czasopiśmie z listy filadelfijskiej
Published in:: PHYSICAL REVIEW LETTERS no. 100, pages 0 - 4,
ISSN: 0031-9007
Language:: English
Publication year:: 2008
Bibliographic description:: Piani M., Horodecki P., Horodecki R.: No-local-broadcasting theorem for multipartite quantum correlations// PHYSICAL REVIEW LETTERS. -Vol. 100., nr. iss. 9 (2008), s.0-4
Verified by:: Gdańsk University of Technology