Reviews of topical problems

The nonclassical light

Lomonosov Moscow State University, Department of Physics, Vorobevy gory, Moscow, 119992, Russian Federation

Properties of the nonclassical light (NCL) have been considered with an emphasis on experimentally-observed features, which are underlain by the well-known Mandel’s formula connecting the statistics of photocounts with that of light falling on the detector. A systematic operational approach is presented to study the NCL using two parallel sets of numbers measured: probabilities of photocounts {pm} and normalised factorial moments of counts {gk}. Two particular examples are examined in detail: a ’heated’ squeezed vacuum and a ’heated’ one-photon state. An alternative method is proposed to discover the week nonclassicality using ’generalised’ moments {ak(s)}. The effect of the linear absorption (amplification) and of the beam-splitting of the NCL, and the relation between the NCL and the absolute calibration of photodetectors are considered. The conditions are elucidated whereat the beam-splitter realises a mathematical operation of superposition of two one-mode fields useful in studying the NCL.

Text can be downloaded in Russian. English translation is available on IOP Science.
PACS: 03.65.Bz, 12.20.Ds, 07.60.Dq, 42.50.Dv (all)
DOI: 10.1070/PU1996v039n06ABEH000149
Citation: Klyshko D N "The nonclassical light" Phys. Usp. 39 573–596 (1996)
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Оригинал: Клышко Д Н «Неклассический свет» УФН 166 613–638 (1996); DOI: 10.3367/UFNr.0166.199606b.0613

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