Orthogonality catastrophe as a consequence of qubit embedding in an ultracold Fermi gas

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dc.contributor.authorGoold, John
dc.contributor.authorFogarty, Thomás
dc.contributor.authorLo Gullo, Nicola
dc.contributor.authorPaternostro, Mauro
dc.contributor.authorBusch, Thomas
dc.contributor.funderEngineering and Physical Sciences Research Council
dc.contributor.funderScience Foundation Ireland
dc.contributor.funderIrish Research Council for Science, Engineering and Technology
dc.date.accessioned2017-08-22T10:30:38Z
dc.date.available2017-08-22T10:30:38Z
dc.date.issued2011
dc.description.abstractWe investigate the behavior of a two-level atom coupled to a one-dimensional, ultracold Fermi gas. The sudden switching on of the scattering between the two entities leads to the loss of any coherence in the initial state of the impurity and we show that the exact dynamics of this process is strongly influenced by the effect of the orthogonality catastrophe within the gas. We highlight the relationship between the Loschmidt echo and the retarded Green's function-typically used to formulate the dynamical theory of the catastrophe-and demonstrate that the effect is reflected in the impurity dynamics. We show that the expected nonexponential decay of the spectral function can be observed using Ramsey interferometry on the two-level atom and comment on finite temperature effects.en
dc.description.sponsorshipScience Foundation Ireland (05/IN/I852, 05/IN/I852 NS, 10/IN.1/I2979); Irish Research Council for Science, Engineering and Technology (Embark Initiative (RS/2009/1082); Engineering and Physical Sciences Research Council (EP/G004579/1)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid63632
dc.identifier.citationGoold, J., Fogarty, T., Lo Gullo, N., Paternostro, M. and Busch, T. (2011) 'Orthogonality catastrophe as a consequence of qubit embedding in an ultracold Fermi gas', Physical Review A, 84(6), 063632 (6pp). doi: 10.1103/PhysRevA.84.063632en
dc.identifier.doi10.1103/PhysRevA.84.063632
dc.identifier.issn1050-2947
dc.identifier.issued6
dc.identifier.journaltitlePhysical Review Aen
dc.identifier.urihttps://hdl.handle.net/10468/4506
dc.identifier.volume84
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.relation.urihttps://journals.aps.org/pra/abstract/10.1103/PhysRevA.84.063632
dc.rights© 2011, American Physical Societyen
dc.subjectFermi gasen
dc.subjectTwo-level atomen
dc.subjectOrthogonality catastropheen
dc.subjectLoschmidt echoen
dc.subjectGreen's functionen
dc.subjectRamsey interferometryen
dc.titleOrthogonality catastrophe as a consequence of qubit embedding in an ultracold Fermi gasen
dc.typeArticle (peer-reviewed)en
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