Experimental Demonstration of Macroscopic Quantum Coherence in Gaussian States

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dc.creatorMarquardt, Christoph
dc.creatorAndersen, Ulrik L.
dc.creatorLeuchs, Gerd
dc.creatorTakeno, Yuishi
dc.creatorYukawa, Mitsuyoshi
dc.creatorYonezawa, Hidehiro
dc.creatorFurusawa, Akira
dc.date2007-02-23
dc.date.accessioned2026-07-07T10:06:16Z
dc.date.available2026-07-07T10:06:16Z
dc.descriptionWe witness experimentally the presence of macroscopic coherence in Gaussian quantum states using a recently proposed criterion (E.G. Cavalcanti and M. Reid, Phys. Rev. Lett. 97, 170405 (2006)). The macroscopic coherence stems from interference between macroscopically distinct states in phase space and we prove experimentally that even the vacuum state contains these features with a distance in phase space of $0.51\pm0.02$ shot noise units (SNU). For squeezed states we found macroscopic superpositions with a distance of up to $0.83\pm0.02$ SNU. The proof of macroscopic quantum coherence was investigated with respect to squeezing and purity of the states.
dc.description5 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/quant-ph/0702215
dc.identifierhttp://arxiv.org/abs/quant-ph/0702215
dc.identifierPhys. Rev. A, 76 (3), 030101 (2007)
dc.identifierdoi:10.1103/PhysRevA.76.030101
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/170270
dc.subjectQuantum Physics
dc.titleExperimental Demonstration of Macroscopic Quantum Coherence in Gaussian States
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