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Quantum noise reduction by beam coupling in photorefractive media

Mark E. Saffman

Published Jan 1, 1996• 0 citations
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Abstract

Quantum noise reduction by beam coupling inphotorefractive mediaMark SaffmanDepartment of Optics and Fluid Dynamics,RisO National Laboratory, DK-4000 Roskilde, Denmarke-mail: saffman@risoe.dkABSTRACTI propose a new approach to generation of sub-Poissonian twin beams. A perturbative analysisshows that frequency dependent redistribution of fluctuations between photorefractivelycoupled beams results in output beams with sub shot noise intensity correlations.Keywords: quantum optics, squeezing, photorefractives1. INTRODUCTIONTwin beams that exhibit intensity correlations below the shot noise limit have been generated

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Quantum noise reduction by beam coupling inphotorefractive mediaMark SaffmanDepartment of Optics and Fluid Dynamics,RisO National Laboratory, DK-4000 Roskilde, Denmarke-mail: saffman@risoe.dkABSTRACTI propose a new approach to generation of sub-Poissonian twin beams. A perturbative analysisshows that frequency dependent redistribution of fluctuations between photorefractivelycoupled beams results in output beams with sub shot noise intensity correlations.Keywords: quantum optics, squeezing, photorefractives1. INTRODUCTIONTwin beams that exhibit intensity correlations below the shot noise limit have been generated
The low-frequency intensity noise of high-quantum-efficiency lasers or light-emitting diodes (LED's) is dominated by the pump noise. By coupling two or more semiconductor lasers (or LED's) in series with a current source, the pump noise of the two lasers will be equal, and the intensity noise of the lasers will be highly correlated. It is shown that one may generate sub-Poissonian light by measuring the intensity fluctuations of one of the beams and feeding back (or forward) the information to regulate the other photon beam. The generation scheme is shown to have much in common with intensity-correlated twin beam generation from nondegenerate optical parametric oscillators.
The signal and idler beams from a non-degenerate, above threshold, optical parametric oscillator have a strong quantum correlation, which are called twin beams. This correlation arises from the simultaneous generation of the signal and idler photons in the form of twin pairs of photons through the parametric down conversion, and the generated twin beams have exactly the same photon statistics. As a result, the fluctuations on the difference between the intensities of the twin beams are reduced with respect to the shot noise limit, that is, intensity-difference squeezing. We give a comprehensive overview of the generation of twin beams using the optical parametric oscillator, and the applications exploiting the quantum correlation of twin beams are presented.
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.