Quantum statistics and locality

Details Quantum statistics and locality Quantum statistics and locality

2004-03-21

arxiv.org/abs/quant-ph/0403149v1

Phys.Lett. A337 (2005) 17-21

Physics

Quantum Physics

3 pages, no figures

Scientific paper

10.1016/j.physleta.2005.01.055

It is shown that two observers have mutually commuting observables if they are able to prepare in each subsector of their common state space some state exhibiting no mutual correlations. This result establishes a heretofore missing link between statistical and locality (commensurability) properties of the observables of spacelike separated observers in relativistic quantum physics, envisaged four decades ago by Haag and Kastler. It is based on a discussion of coincidence experiments and suggests a physically meaningful quantitative measure of possible violations of Einstein causality.

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