Mechanisms for the Generation of Nonclassical Light
In this lecture I review some of my recent proposals1–5 for the production of the nonclassical states of the radiation field. In the first part I demonstrate how the fields at the Rabi side bands and the subharmonics2,3 of the Rabi side bands which are produced in a number of nonlinear mixing processes possess very strong quantum characteristics. I present theories2,3 that describe the generation of the Rabi side bands and their subharmonics starting from vacuum fluctuations. These theories yield the distribution function of the radiation field so generated. I then present the unusual photon number distributions6,7 associated with such fields. In the second part of my lecture I consider a scheme1,4,5,8 for producing steady state fields with strong quantum features. Clearly steady state is possible by controlling the growth of fields in a parametric process. This could happen in a dense medium where several nonlinear processes are simultaneously possible. I thus consider a two photon medium in which a strong competition among four wave mixing, two photon absorption, amplified spontaneous emission and the reabsorption of the generated photons leads to steady state fields with remarkable quantum properties such as squeezing, sub Poissonian statistics, violations of the Cauchy-Schwarz inequality. I also demonstrate the generation of a new class of coherent states called pair coherent states which are fundamental in understanding the behavior of the radiation fields in situations where the photons are destroyed or created in pairs.
KeywordsCoherent State Wigner Function Photon Number Photon Absorption Rabi Frequency
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