Nonlocality and entanglement in a strange system

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–anti-particle mixing) and decaying – and describe it as an open quantum system. We consider a Bell–CHSH...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2007-03, Vol.50 (1), p.73-79
Main Author: Hiesmayr, B.C.
Format: Article
Language:English
Subjects:
Entangled states
Kaons
Particle decay
Quantum entanglement
Quantum theory
Qubits (quantum computing)
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Summary: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–anti-particle 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.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-006-0199-x