Coherent states and the classical-quantum limit considered from the point of view of entanglement,

Thomas Durt 1 Debierre Vincent 1
1 CLARTE - CLARTE
FRESNEL - Institut FRESNEL
Abstract : We consider the quasi-classical situation in which a quantum system interacts with another quantum system or with a quantum environment without getting entangled with it. We show how this regime is intimately linked to three paradigms commonly used in classical, pre-quantum physics to describe particles (that is, the material point, the test particle and the diluted particle (droplet model)). This entanglement-free regime also provides a simplified insight on what is called in the decoherence approach "islands of classicality", that is, preferred bases that would be selected through evolution by a Darwinist mechanism which aims at optimizing information. We show how, under very general conditions, coherent states are natural candidates for classical pointer states. This occurs essentially because, when a (supposedly bosonic) system coherently exchanges only one quantum at a time with its (supposedly bosonic) environment, coherent states of the system do not get entangled with the environment, due to the bosonic symmetry.
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Submitted on : Wednesday, February 12, 2014 - 3:08:30 PM
Last modification on : Monday, March 4, 2019 - 2:04:23 PM

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Thomas Durt, Debierre Vincent. Coherent states and the classical-quantum limit considered from the point of view of entanglement,. International Journal of Modern Physics B, World Scientific Publishing, 2012, 27 (01-3), pp.1345014. ⟨10.1142/S0217979213450148⟩. ⟨hal-00945568⟩

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