Quantum correlations relativity

What is it about?

Every quantum system can be differently decomposed (structured) into subsystems, including the 'virtual' subsystems such as the center of mass or relative degrees of freedom. It appears that different structures of a composite system carry different amounts of correlations (quantum or classical) and that 'correlations' is not as much a characteristic of a system as it is a characteristic of the system's structure.

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Why is it important?

While 'Entanglement relativity' is known and rediscovered in the past 15 years, relativity of 'quantum discord' is proved for the first time. Hence one may say that 'correlations' in bipartitions of quantum systems is partition-specific and of universal character: it applies to open/closed finite- or infinite-dimensional quantum systems.