Quantum Non-Demolition Measurement of an Optical Intensity in a Three-Level Atomic Non-Linear System

Grangier, Philippe; Roch, Jean-François; Roger, G.

doi:10.1007/978-1-4615-3386-3_7

Quantum Measurements in Optics

1992

DOI: 10.1007/978-1-4615-3386-3_7

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Quantum Non-Demolition Measurement of an Optical Intensity in a Three-Level Atomic Non-Linear System

Philippe Grangier

Jean-François Roch

G. Roger

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2007

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“…Photons can then be detected without loss. Dispersive schemes have been applied to detect the fluctuations of a signal light beam by the phase shifts it induces on a probe beam interacting with the same medium 15,16 . Neither these methods, nor alternative ones based on the noiseless duplication of light by optical parametric amplifiers 17,18 , have been able, so far, to pin down photon numbers.…”

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confidence: 99%

Progressive field-state collapse and quantum non-demolition photon counting

Guerlin

Bernu

Deléglise

et al. 2007

Nature

476

499

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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 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.

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mentioning

confidence: 99%

Progressive field-state collapse and quantum non-demolition photon counting

Guerlin

Bernu

Deléglise

et al. 2007

Nature

476

499

View full text Add to dashboard Cite

show abstract

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Quantum Non-Demolition Measurement of an Optical Intensity in a Three-Level Atomic Non-Linear System

Cited by 1 publication

References 18 publications

Progressive field-state collapse and quantum non-demolition photon counting

Progressive field-state collapse and quantum non-demolition photon counting

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