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dc.contributor.authorVitagliano, Giuseppe
dc.contributor.authorApellaniz Asategui, Jagoba
dc.contributor.authorKleinmann, Matthias
dc.contributor.authorLücke, Bernd
dc.contributor.authorKlempt, Carsten
dc.contributor.authorTóth, Géza
dc.date.accessioned2017-05-11T08:12:18Z
dc.date.available2017-05-11T08:12:18Z
dc.date.issued2017-01-20
dc.identifier.citationNew Journal of Physics 19 : (2017) // Article ID 013027es_ES
dc.identifier.issn1367-2630
dc.identifier.urihttp://hdl.handle.net/10810/21506
dc.description.abstractWe present criteria to detect the depth of entanglement in macroscopic ensembles of spin-j particles using the variance and second moments of the collective spin components. The class of states detected goes beyond traditional spin-squeezed states by including Dicke states and other unpolarized states. The criteria derived are easy to evaluate numerically even for systems of very many particles and outperform past approaches, especially in practical situations where noise is present. We also derive analytic lower bounds based on the linearization of our criteria, which make it possible to define spin-squeezing parameters for Dicke states. In addition, we obtain spin squeezing parameters also from the condition derived in (Sorensen and Molmer 2001 Phys. Rev. Lett. 86 4431). We also extend our results to systems with fluctuating number of particles.es_ES
dc.description.sponsorshipWe thank G Colangelo, LM Duan, O Guhne, P Hyllus, M W Mitchell, and J Peise for discussions. This work was supported by the EU (ERC Starting Grant 258647/GEDENTQOPT, CHIST-ERA QUASAR, COST Action CA15220) the Spanish MINECO (Project No. FIS2012-36673-C03-03 and No. FIS2015-67161-P), the Basque Government (Project No. IT4720-10), the National Research Fund of Hungary OTKA (Contract No. K83858), the DFG (Forschungsstipendium KL 2726/2-1), and the FQXi (Grant No. FQXi-RFP-1608). We also acknowledge support from the Centre QUEST, the DFG through RTG 1729 and CRC 1227 (DQ-mat), project A02, and the EMRP.es_ES
dc.language.isoenges_ES
dc.publisherIOP Publishinges_ES
dc.relationinfo:eu-repo/grantAgreement/MINECO/FIS2012-36673-C03-03
dc.relationinfo:eu-repo/grantAgreement/MINECO/FFIS2015-67161-P
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc/3.0/es/*
dc.subjectquantum entanglementes_ES
dc.subjectspin squeezinges_ES
dc.subjectDicke stateses_ES
dc.subjectentanglement detectiones_ES
dc.subjectBose-Einstein condensatees_ES
dc.subjectstandard quantum limites_ES
dc.subjectatomses_ES
dc.subjectspectroscopyes_ES
dc.subjectgenerationes_ES
dc.subjectensemblees_ES
dc.subjectnoisees_ES
dc.subjecttimeses_ES
dc.titleEntanglement and extreme spin squeezing of unpolarized stateses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.relation.publisherversionhttp://iopscience.iop.org/article/10.1088/1367-2630/19/1/013027/meta;jsessionid=50D9DBAB1820C53FAFF3E4BA4190FC53.c1.iopscience.cld.iop.orges_ES
dc.identifier.doi10.1088/1367-2630/19/1/013027
dc.departamentoesFísica teórica e historia de la cienciaes_ES
dc.departamentoeuFisika teorikoa eta zientziaren historiaes_ES
dc.subject.categoriaPHYSICS AND ASTRONOMY


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