Quantum correlations relativity for continuous variable systems

It is shown that a choice of degrees of freedom of a bipartite continuous variable system determines the 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 suc...

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Bibliographic Details
Published in:Science China. Physics, mechanics & astronomy mechanics & astronomy, 2013-04, Vol.56 (4), p.732-736
Main Authors: Dugic, M, Arsenijevic, M, Jeknic-Dugic, J
Format: Article
Language:English
Subjects:
Astronomy
Classical and Continuum Physics
Continuity (mathematics)
Correlation
Degrees of freedom
Observations and Techniques
Physics
Physics and Astronomy
Relativity
可变系统
和谐
复合系统
相对论
连续变量系统
量子关联
量子态
非经典
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Summary:It is shown that a choice of degrees of freedom of a bipartite continuous variable system determines the 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.
ISSN:1674-7348
1869-1927
DOI:10.1007/s11433-012-4912-5