Interference of Bose-Einstein condensates: quantum non-local effects

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dc.creatorMullin, William W. J.
dc.creatorLaloë, Franck
dc.date2008-05-01
dc.date2009-05-19
dc.date.accessioned2026-07-07T13:15:44Z
dc.date.available2026-07-07T13:15:44Z
dc.descriptionQuantum systems in Fock states do not have a phase. When two or more Bose-Einstein condensates are sent into interferometers, they nevertheless acquire a relative phase under the effect of quantum measurements. The usual explanation relies on spontaneous symmetry breaking, where phases are ascribed to all condensates and treated as unknown classical quantities. However, this image is not always sufficient: when all particles are measured, quantum mechanics predicts probabilities that are sometimes in contradiction with it, as illustrated by quantum violations of local realism. In this letter, we show that interferometers can be used to demonstrate a large variety of violations with an arbitrarily large number of particles. With two independent condensates, we find violations of the BCHSH inequalities, as well as new N-body Hardy impossibilities. With three condensates, we obtain new GHZ (Greenberger, Horne and Zeilinger) type contradictions.
dc.descriptionversion published in Phys Rev
dc.identifierhttps://arxiv.org/abs/0805.0105
dc.identifierhttp://arxiv.org/abs/0805.0105
dc.identifierPhysical Review A: Atomic, Molecular and Optical Physics A78 (2008) 061605
dc.identifierdoi:10.1103/PhysRevA.78.061605
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/230566
dc.subjectQuantum Physics
dc.subjectOther Condensed Matter
dc.titleInterference of Bose-Einstein condensates: quantum non-local effects
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