Coherence and Entanglement in a Stern-Gerlach experiment

Details Coherence and Entanglement in a Stern-Gerlach experiment Coherence and Entanglement in a Stern-Gerlach experiment

2006-08-24

arxiv.org/abs/quant-ph/0608192v1

Physics

Quantum Physics

Scientific paper

We give a simple example of the tight connection between entanglement and coherence for pure bipartite systems showing the double role played by entanglement; it allows for the creation of superpositions of macroscopic objects but at the same time makes subsystems lose their quantum mechanical coherence. For this we study the time evolution of the spin coherence in the Stern-Gerlach (SG) experiment. We also show that, contrary to the naive intuition, the spin coherence is lost before the two beams become separated in the spatial coordinates.

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