Unified Framework for Correlations in Terms of Local Quantum Observables

Details Unified Framework for Correlations in Terms of Local Quantum Observables Unified Framework for Correlations in Terms of Local Quantum Observables

2009-11-18

arxiv.org/abs/0911.3606v3

Physical Review Letters 104, 140404 (2010)

Physics

Quantum Physics

4 pages, final version

Scientific paper

We provide a unified framework for nonsignalling quantum and classical multipartite correlations, allowing all to be written as the trace of some local (quantum) measurements multiplied by an operator. The properties of this operator define the corresponding set of correlations.We then show that if the theory is such that all local quantum measurements are possible, one obtains the correlations corresponding to the extension of Gleason's Theorem to multipartite systems. Such correlations coincide with the quantum ones for one and two parties, but we prove the existence of a gap for three or more parties.

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