Nonlocality and entanglement in a strange system

Details Nonlocality and entanglement in a strange system Nonlocality and entanglement in a strange system

2006-07-28

arxiv.org/abs/quant-ph/0607210v5

European Physical Journal C, Vol. 50, 73-79 (2007)

Physics

Quantum Physics

7 pages, 2 figures, extended version

Scientific paper

10.1140/epjc/s10052-006-0199-x

We show that the relation between nonlocality and entanglement is subtler than one naively expects. In order to do this we consider the neutral kaon system--which is oscillating in time (particle--antiparticle mixing) and decaying--and describe it as an open quantum system. We consider a Bell--CHSH inequality and show a novel violation for non--maximally entangled states. Considering the change of purity and entanglement in time we find that, despite the fact that only two degrees of freedom at a certain time can be measured, the neutral kaon system does not behave like a bipartite qubit system.

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