Memory-keeping effects and forgetfulness in the dynamics of a qubit coupled to a spin chain

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dc.contributor.authorApollaro, Tony J. G.
dc.contributor.authorDi Franco, Carlo
dc.contributor.authorPlastina, Francesco
dc.contributor.authorPaternostro, Mauro
dc.contributor.funderBritish Council
dc.contributor.funderEngineering and Physical Sciences Research Council
dc.contributor.funderMinistero dell’Istruzione, dell’Università e della Ricerca
dc.contributor.funderIrish Research Council for Science, Engineering and Technology
dc.date.accessioned2017-08-25T10:08:51Z
dc.date.available2017-08-25T10:08:51Z
dc.date.issued2011
dc.description.abstractUsing recently proposed measures for non-Markovianity [H.-P. Breuer, E. M. Laine, and J. Piilo, Phys. Rev. Lett. 103, 210401 (2009)], we study the dynamics of a qubit coupled to a spin environment via an energy-exchange mechanism. We show the existence of a point, in the parameter space of the system, where the qubit dynamics is effectively Markovian and that such a point separates two regions with completely different dynamical behaviors. Indeed, our study demonstrates that the qubit evolution can in principle be tuned from a perfectly forgetful one to a deep non-Markovian regime where the qubit is strongly affected by the dynamical backaction of the environmental spins. By means of a theoretical quantum process tomography analysis, we provide a complete and intuitive characterization of the qubit channel.en
dc.description.sponsorshipMinistero dell’Istruzione, dell’Università e della Ricerca/British Council (British-Italian Partnership Programme 2009-2010, 2008PARRTS003); Engineering and Physical Sciences Research Council(EP/G004579/1)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid32103
dc.identifier.citationApollaro, T. J. G., Di Franco, C., Plastina, F. and Paternostro, M. (2011) 'Memory-keeping effects and forgetfulness in the dynamics of a qubit coupled to a spin chain', Physical Review A, 83(3), 032103 (10pp). doi: 10.1103/PhysRevA.83.032103en
dc.identifier.doi10.1103/PhysRevA.83.032103
dc.identifier.issn2469-9926
dc.identifier.issn2469-9934
dc.identifier.issued3
dc.identifier.journaltitlePhysical Review Aen
dc.identifier.urihttps://hdl.handle.net/10468/4527
dc.identifier.volume83
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.relation.urihttps://journals.aps.org/pra/abstract/10.1103/PhysRevA.83.032103
dc.rights© 2011, American Physical Societyen
dc.subjectMapsen
dc.titleMemory-keeping effects and forgetfulness in the dynamics of a qubit coupled to a spin chainen
dc.typeArticle (peer-reviewed)en
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