Decoherence as a signature of an excited-state quantum phase transition

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dc.contributor.authorRelaño Pérez, Armando
dc.contributor.authorArias, J. M.
dc.contributor.authorDukelsky, J.
dc.contributor.authorGarcía Ramos, J. E.
dc.contributor.authorPérez Fernández, P.
dc.date.accessioned2023-06-20T10:48:42Z
dc.date.available2023-06-20T10:48:42Z
dc.date.issued2008-12
dc.description© 2008 The American Physical Society. This work has been partially supported by the Spanish Ministerio de Educacion y Ciencia and by the European Regional Development Fund (FEDER) under Projects No. FIS2005-01105, No. FIS2006-12783-C03-01, No. FPA2006-13807-C02-02, and No. FPA2007-63074, by Comunidad de Madrid and CSIC under Project No. 200650M012, and by Junta de Analucia under Projects No. FQM160, No. FQM318, No. P05-FQM437, and No. P07-FQM-02962. A. R. was supported by the Spanish program "Juan de la Cierva," and P. P- F. by a grant from the Plan Propio of the University of Sevilla.
dc.description.abstractWe analyze the decoherence induced on a single qubit by the interaction with a two-level boson system with critical internal dynamics. We explore how the decoherence process is affected by the presence of quantum phase transitions in the environment. We conclude that the dynamics of the qubit changes dramatically when the environment passes through a continuous excited state quantum phase transition. If the system-environment coupling energy equals the energy at which the environment has a critical behavior, the decoherence induced on the qubit is maximal and the fidelity tends to zero with finite size scaling obeying a power law.
dc.description.departmentDepto. de Estructura de la Materia, Física Térmica y Electrónica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Educación y Ciencia
dc.description.sponsorshipEuropean Regional Development Fund (FEDER)
dc.description.sponsorshipComunidad de Madrid
dc.description.sponsorshipCSIC
dc.description.sponsorshipJunta de Andalucia
dc.description.sponsorshipSpanish program "Juan de la Cierva,"
dc.description.sponsorshipPlan Propio of the University of Sevilla
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/27594
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dc.identifier.doi10.1103/PhysRevA.78.060102
dc.identifier.issn1050-2947
dc.identifier.officialurlhttp://dx.doi.org/10.1103/PhysRevA.78.060102
dc.identifier.relatedurlhttp://journals.aps.org/pra/
dc.identifier.urihttps://hdl.handle.net/20.500.14352/51266
dc.issue.number6
dc.journal.titlePhysical Review A
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.relation.projectIDFIS2005-01105
dc.relation.projectIDFIS2006-12783-C03-01
dc.relation.projectIDFPA2006-13807-C02-02
dc.relation.projectIDFPA2007-63074
dc.relation.projectID200650M012
dc.relation.projectIDFQM160
dc.relation.projectIDFQM318
dc.relation.projectIDP05-FQM437
dc.relation.projectIDP07-FQM-02962
dc.rights.accessRightsopen access
dc.subject.cdu536
dc.subject.keywordLipkin Model
dc.subject.keywordSystems
dc.subject.ucmTermodinámica
dc.subject.unesco2213 Termodinámica
dc.titleDecoherence as a signature of an excited-state quantum phase transition
dc.typejournal article
dc.volume.number78
dspace.entity.typePublication
relation.isAuthorOfPublication53fed635-944b-485a-b13a-ea8f9355b7aa
relation.isAuthorOfPublication.latestForDiscovery53fed635-944b-485a-b13a-ea8f9355b7aa
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