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Progressive field-state collapse and quantum non demolition photon counting

Guerlin, C; Bernu, Julien; Deleglise, S; Sayrin, C; Gleyzes, S; Kuhr, S; Brune, M; Raimond, J-M; Haroche, S

Description

The irreversible evolution of a microscopic system under measurement is a central feature of quantum theory. From an initial state generally exhibiting quantum uncertainty in the measured observable, the system is projected into a state in which this observable becomes precisely known. Its value is random, with a probability determined by the initial system's state. The evolution induced by measurement (known as 'state collapse') can be progressive, accumulating the effects of elementary state...[Show more]

dc.contributor.authorGuerlin, C
dc.contributor.authorBernu, Julien
dc.contributor.authorDeleglise, S
dc.contributor.authorSayrin, C
dc.contributor.authorGleyzes, S
dc.contributor.authorKuhr, S
dc.contributor.authorBrune, M
dc.contributor.authorRaimond, J-M
dc.contributor.authorHaroche, S
dc.date.accessioned2015-12-10T22:26:34Z
dc.identifier.issn0028-0836
dc.identifier.urihttp://hdl.handle.net/1885/53827
dc.description.abstractThe irreversible evolution of a microscopic system under measurement is a central feature of quantum theory. From an initial state generally exhibiting quantum uncertainty in the measured observable, the system is projected into a state in which this observable becomes precisely known. Its value is random, with a probability determined by the initial system's state. The evolution induced by measurement (known as 'state collapse') can be progressive, accumulating the effects of elementary state changes. Here we report the observation of such a step-by-step collapse by non-destructively measuring the photon number of a field stored in a cavity. Atoms behaving as microscopic clocks cross the cavity successively. By measuring the light-induced alterations of the clock rate, information is progressively extracted, until the initially uncertain photon number converges to an integer. The suppression of the photon number spread is demonstrated by correlations between repeated measurements. The procedure illustrates all the postulates of quantum measurement (state collapse, statistical results and repeatability) and should facilitate studies of non-classical fields trapped in cavities.
dc.publisherMacmillan Publishers Ltd
dc.sourceNature
dc.subjectKeywords: light; measurement method; quantum mechanics; statistical analysis; article; correlation analysis; mathematical parameters; photon; photon correlation spectroscopy; priority journal; quantum theory; statistical significance; temperature measurement
dc.titleProgressive field-state collapse and quantum non demolition photon counting
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume488
dc.date.issued2007
local.identifier.absfor020600 - QUANTUM PHYSICS
local.identifier.ariespublicationu4222028xPUB284
local.type.statusPublished Version
local.contributor.affiliationGuerlin, C, University Paris
local.contributor.affiliationBernu, Julien, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationDeleglise, S, Universite Pierre et Marie Curie
local.contributor.affiliationSayrin, C, Universite Pierre et Marie Curie
local.contributor.affiliationGleyzes, S, University Paris
local.contributor.affiliationKuhr, S, University Paris
local.contributor.affiliationBrune, M, Universite Pierre et Marie Curie
local.contributor.affiliationRaimond, J-M, University Paris
local.contributor.affiliationHaroche, S, College de France
local.description.embargo2037-12-31
local.bibliographicCitation.startpage890
local.bibliographicCitation.lastpage895
local.identifier.doi10.1038/nature06057
dc.date.updated2015-12-09T09:33:14Z
local.identifier.scopusID2-s2.0-34548155447
CollectionsANU Research Publications

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