Publication:
Energy cat states induced by a parity-breaking excited-state quantum phase transition

dc.contributor.authorCorps, Angel L.
dc.contributor.authorRelaño Pérez, Armando
dc.date.accessioned2023-06-22T10:50:27Z
dc.date.available2023-06-22T10:50:27Z
dc.date.issued2022-05-09
dc.description©2022 American Physical Society. We gratefully thank F. Pérez-Bernal and J. Dukelsky for insightful discussions. This work has been supported by the Spanish Grant No. PGC-2018-094180-B-I00 funded by Ministerio de Ciencia e Innovación/Agencia Estatal de Investigación MCIN/AEI/10.13039/501100011033 and FEDER "A Way of Making Europe." A.L.C. acknowledges financial support from "la Caixa" Foundation (Grant No. 100010434) through the fellowship LCF/BQ/DR21/11880024.
dc.description.abstractWe show that excited-state quantum phase transitions (ESQPTs) in a system in which the parity symmetry is broken can be used to engineer an energy cat state???a Schr??dinger cat state involving a quantum superposition of both different positions and energies. By means of a generalization of the Rabi model, we show that adding a parity-breaking term annihilates the ground-state quantum phase transition between normal and superradiant phases, and induces the formation of three excited-state phases, all of them identified by means of an observable with two eigenvalues. In one of these phases, level crossings are observed in the thermodynamic limit. These allow us to separate a wave function into two parts: one, with lower energy, trapped within one region of the spectrum, and a second one, with higher energy, trapped within another. Finally, we show that a generalized microcanonical ensemble, including two different average energies, is required to properly describe equilibrium states in this situation. Our results illustrate yet another physical consequence of ESQPTs.
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 Ciencia e Innovación (MICINN)/FEDER
dc.description.sponsorshipFundación "la Caixa"
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/73425
dc.identifier.doi10.1103/PhysRevA.105.052204
dc.identifier.issn2469-9926
dc.identifier.officialurlhttps://doi.org/10.1103/PhysRevA.105.052204
dc.identifier.relatedurlhttps://journals.aps.org/
dc.identifier.urihttps://hdl.handle.net/20.500.14352/71762
dc.issue.number5
dc.journal.titlePhysical review A
dc.language.isoeng
dc.publisherAmer Physical Soc
dc.relation.projectIDPGC-2018-094180-B-I00; MCIN/AEI/10.13039/501100011033
dc.relation.projectIDLCF/BQ/DR21/11880024
dc.rights.accessRightsopen access
dc.subject.cdu536
dc.subject.keywordThermalization
dc.subject.keywordDynamics
dc.subject.keywordNumber
dc.subject.keywordChaos
dc.subject.ucmTermodinámica
dc.subject.unesco2213 Termodinámica
dc.titleEnergy cat states induced by a parity-breaking excited-state quantum phase transition
dc.typejournal article
dc.volume.number105
dspace.entity.typePublication
relation.isAuthorOfPublication53fed635-944b-485a-b13a-ea8f9355b7aa
relation.isAuthorOfPublication.latestForDiscovery53fed635-944b-485a-b13a-ea8f9355b7aa
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