Quantum Correlations Relativity for Continuous Variable Systems
arXiv:1112.5797 · doi:10.1007/s11433-012-4912-5
Abstract
It is shown that a choice of degrees of freedom of a bipartite continuous variable system determines amount of non-classical correlations (quantified by discord) in the system's state. Non-classical correlations (that include entanglement as a special kind of correlations) are ubiquitous for such systems. For a quantum state, if there are not non-classical correlations (quantum discord is zero) for one, there are in general non-classical correlations (quantum discord is non-zero) for another set of the composite system's degrees of freedom. The physical relevance of this 'quantum correlations relativity' is emphasized also in the more general context.
rewritten, 10 pages; accepted by Science China PMA (2012)
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- On dynamical stability of composite quantum particles: when entanglement is enough and when interaction is needed
- Complete positivity on the subsystems level