dc.contributor.author | Gambetta, J | |
dc.contributor.author | Wiseman, HM | |
dc.date.accessioned | 2017-05-03T11:50:54Z | |
dc.date.available | 2017-05-03T11:50:54Z | |
dc.date.issued | 2002 | |
dc.date.modified | 2009-10-12T23:13:03Z | |
dc.identifier.issn | 1050-2947 | |
dc.identifier.doi | 10.1103/PhysRevA.66.012108 | |
dc.identifier.uri | http://hdl.handle.net/10072/6989 | |
dc.description.abstract | Do 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.peerreviewed | Yes | |
dc.description.publicationstatus | Yes | |
dc.format.extent | 257514 bytes | |
dc.format.mimetype | application/pdf | |
dc.language | English | |
dc.language.iso | eng | |
dc.publisher | American Physical Society | |
dc.publisher.place | USA | |
dc.publisher.uri | http://prola.aps.org/ | |
dc.relation.ispartofpagefrom | 012108.1 | |
dc.relation.ispartofpageto | 012108.17 | |
dc.relation.ispartofjournal | Physical Review A: Atomic, Molecular and Optical Physics | |
dc.relation.ispartofvolume | 66 | |
dc.subject.fieldofresearch | Mathematical sciences | |
dc.subject.fieldofresearch | Physical sciences | |
dc.subject.fieldofresearch | Chemical sciences | |
dc.subject.fieldofresearchcode | 49 | |
dc.subject.fieldofresearchcode | 51 | |
dc.subject.fieldofresearchcode | 34 | |
dc.title | Non-Markovian stochastic Schrodinger equations: Generalization to real-valued noise using quantum measurement theory. | |
dc.type | Journal article | |
dc.type.description | C1 - Articles | |
dc.type.code | C - 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.issued | 2002 | |
gro.hasfulltext | Full Text | |
gro.griffith.author | Wiseman, Howard M. | |