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dc.contributor.authorGambetta, J
dc.contributor.authorWiseman, HM
dc.date.accessioned2017-05-03T11:50:54Z
dc.date.available2017-05-03T11:50:54Z
dc.date.issued2002
dc.date.modified2009-10-12T23:13:03Z
dc.identifier.issn1050-2947
dc.identifier.doi10.1103/PhysRevA.66.012108
dc.identifier.urihttp://hdl.handle.net/10072/6989
dc.description.abstractDo stochastic Schr椩nger equations, also known as unravelings, have a physical interpretation? In the Markovian limit, where the system on average obeys a master equation, the answer is yes. Markovian stochastic Schr椩nger equations generate quantum trajectories for the system state conditioned on continuously monitoring the bath. For a given master equation, there are many different unravelings, corresponding to different sorts of measurement on the bath. In this paper we address the non-Markovian case, and in particular the sort of stochastic Schr椩nger equation introduced by Strunz, Di㳩, and Gisin [Phys. Rev. Lett. 82, 1801 (1999)]. Using a quantum-measurement theory approach, we rederive their unraveling that involves complex-valued Gaussian noise. We also derive an unraveling involving real-valued Gaussian noise. We show that in the Markovian limit, these two unravelings correspond to heterodyne and homodyne detection, respectively. Although we use quantum-measurement theory to define these unravelings, we conclude that the stochastic evolution of the system state is not a true quantum trajectory, as the identity of the state through time is a fiction.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent257514 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.publisher.placeUSA
dc.publisher.urihttp://prola.aps.org/
dc.relation.ispartofpagefrom012108.1
dc.relation.ispartofpageto012108.17
dc.relation.ispartofjournalPhysical Review A: Atomic, Molecular and Optical Physics
dc.relation.ispartofvolume66
dc.subject.fieldofresearchMathematical sciences
dc.subject.fieldofresearchPhysical sciences
dc.subject.fieldofresearchChemical sciences
dc.subject.fieldofresearchcode49
dc.subject.fieldofresearchcode51
dc.subject.fieldofresearchcode34
dc.titleNon-Markovian stochastic Schrodinger equations: Generalization to real-valued noise using quantum measurement theory.
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.copyright© 2002 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
gro.date.issued2002
gro.hasfulltextFull Text
gro.griffith.authorWiseman, Howard M.


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