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dc.contributor.authorBeduini, Federica A.
dc.contributor.authorZielińska, Joanna Ada
dc.contributor.authorLucivero, Vito G.
dc.contributor.authorIcaza Astiz, Yannick A. de
dc.contributor.authorMitchell, Morgan W.
dc.contributor.otherUniversitat Politècnica de Catalunya. Institut de Ciències Fotòniques
dc.identifier.citationBeduini, Federica A. [et al.]. Macroscopic Quantum State Analyzed Particle by Particle. "Physical Review Letters", 27 Març 2015, vol. 114, núm. 120402.
dc.description.abstractMacroscopic quantum phenomena, e.g., superconductivity and squeezing, are believed to result from entanglement of macroscopic numbers of particles. We report the first direct study of this kind of entanglement: we use discrete quantum tomography to reconstruct the joint quantum state of photon pairs extracted from polarization-squeezed light. Our observations confirm several predictions from spinsqueezing theory [Beduini et al., Phys. Rev. Lett. 111, 143601 (2013)], including strong entanglement and entanglement of all photon pairs within the squeezing coherence time. This photon-by-photon analysis may give insight into other macroscopic many-body systems, e.g., photon Bose-Einstein condensates.
dc.publisherACS Publications
dc.subjectÀrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica::Fotònica
dc.subject.lcshQuantum theory
dc.subject.otherQuantum mechanics
dc.titleMacroscopic Quantum State Analyzed Particle by Particle
dc.subject.lemacQuàntums, Teoria dels
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
dc.relation.projectidinfo:eu-repo/grantAgreement/EC/FP7/280169/EU/Atomic Quantum Metrology/AQUMET
local.citation.authorBeduini, Federica A.; Zielińska, Joanna A.; Lucivero, Vito G.; Icaza Astiz, Yannick A. de; Mitchell, Morgan W.
local.citation.publicationNamePhysical Review Letters

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