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Article: Quantum critical dynamics of a qubit coupled to an isotropic Lipkin-Meshkov-Glick bath

TitleQuantum critical dynamics of a qubit coupled to an isotropic Lipkin-Meshkov-Glick bath
Authors
KeywordsPhysics
Issue Date2007
PublisherAmerican Physical Society. The Journal's web site is located at http://pra.aps.org
Citation
Physical Review A - Atomic, Molecular, And Optical Physics, 2007, v. 76 n. 1 How to Cite?
AbstractWe explore a dynamic signature of quantum phase transition (QPT) in an isotropic Lipkin-Meshkov-Glick (LMG) model by studying the time evolution of a central qubit coupled to it. We evaluate exactly the time-dependent purity, which can be used to measure quantum coherence, of the central qubit. It is found that distinctly different behaviors of the purity as a function of the parameter reveal clearly the QPT point in the system. It is also clarified that the present model is equivalent to an anti-Jaynes-Cummings model under certain conditions. © 2007 The American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/57325
ISSN
2014 Impact Factor: 2.808
2015 SCImago Journal Rankings: 1.418
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorQuan, HTen_HK
dc.contributor.authorWang, ZDen_HK
dc.contributor.authorSun, CPen_HK
dc.date.accessioned2010-04-12T01:33:13Z-
dc.date.available2010-04-12T01:33:13Z-
dc.date.issued2007en_HK
dc.identifier.citationPhysical Review A - Atomic, Molecular, And Optical Physics, 2007, v. 76 n. 1en_HK
dc.identifier.issn1050-2947en_HK
dc.identifier.urihttp://hdl.handle.net/10722/57325-
dc.description.abstractWe explore a dynamic signature of quantum phase transition (QPT) in an isotropic Lipkin-Meshkov-Glick (LMG) model by studying the time evolution of a central qubit coupled to it. We evaluate exactly the time-dependent purity, which can be used to measure quantum coherence, of the central qubit. It is found that distinctly different behaviors of the purity as a function of the parameter reveal clearly the QPT point in the system. It is also clarified that the present model is equivalent to an anti-Jaynes-Cummings model under certain conditions. © 2007 The American Physical Society.en_HK
dc.languageengen_HK
dc.publisherAmerican Physical Society. The Journal's web site is located at http://pra.aps.orgen_HK
dc.relation.ispartofPhysical Review A - Atomic, Molecular, and Optical Physicsen_HK
dc.rightsPhysical Review A (Atomic, Molecular and Optical Physics). Copyright © American Physical Society.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectPhysicsen_HK
dc.titleQuantum critical dynamics of a qubit coupled to an isotropic Lipkin-Meshkov-Glick bathen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1050-2947&volume=76&issue=1&spage=012104&epage=1 &date=2007&atitle=Quantum+critical+dynamics+of+a+qubit+coupled+to+an+isotropic+Lipkin-Meshkov-Glick+bathen_HK
dc.identifier.emailWang, ZD: zwang@hkucc.hku.hken_HK
dc.identifier.authorityWang, ZD=rp00802en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1103/PhysRevA.76.012104en_HK
dc.identifier.scopuseid_2-s2.0-34547358660en_HK
dc.identifier.hkuros131547-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34547358660&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume76en_HK
dc.identifier.issue1en_HK
dc.identifier.isiWOS:000248486600022-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridQuan, HT=9844261400en_HK
dc.identifier.scopusauthoridWang, ZD=14828459100en_HK
dc.identifier.scopusauthoridSun, CP=7404248944en_HK

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