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.
- Received 8 August 2007
- Corrected 7 March 2008
DOI:https://doi.org/10.1103/PhysRevLett.100.090502
©2008 American Physical Society
Corrections
7 March 2008