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Czechoslovak Journal of Physics

On the possibilities of experimental demonstration of sub-Poissonian behaviour of light and photon anticorrelation in parametric nonlinear optical processes

Pavel Chmela

Published Oct 1, 1987• 6 citations
Publisher
DOI
10.1007/bf01597031

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Is it possible to number squeeze an already sub-Poissonian electromagnetic field? This work presents a system able to squeeze the sub-Poissonian photon statistics of a beam from the down-conversion luminescence produced in a nonlinear crystal by laser pumping. Parameters are shown to stress the experimental difficulties inherent to the process. Even if this sub-Poissonian proposition for the down-converted light-state turns out to be unrealistic, the proposed system is, in principle, a singular tool in noise reduction processes.
The author reviews methods for generating sub-Poissonian light and related concepts. This light has energy fluctuations reduced below the level which corresponds to a classical Poissonian process (shot-noise level). After an introduction to the concept of nonclassical light, an overview is given of the main methods of quantum-noise reduction. Sub-Poissonian processes are exemplified in different areas of optics, ranging from single-atom resonance fluorescence to nonlinear optics, laser physics, and cavity quantum electrodynamics. Emphasis is placed on the conceptual foundations, and on developments in laser theory that lead to the possibility, already demonstrated experimentally, of linewidth narrowing and sub-Poissonian light generation in lasers and masers. The sources of quantum noise in these devices are analyzed, and four noise-suppression methods are discussed in detail: regularization of the pumping, suppression of spontaneous-emission noise, nonadiabatic evolution of the atomic variables, and twin-beam generation.