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Quantum Optics Journal of the European Optical Society Part B

Observation of large quantum noise reduction using an optical parametric oscillator

Thierry Debuisschert, Serge Reynaud, A. Heidmann, E. Giacobino, Claude Fabre

Published Sep 1, 1989• 70 citations
Publisher

Abstract

The authors have observed a quantum noise reduction of 69% around 2 MHz on the intensity difference between the two beams generated by a non-degenerate optical parametric oscillator operating above threshold.
DOI
10.1088/0954-8998/1/1/001

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A semi-classical analysis of the noise characteristics of a non degenerate, above threshold, optical parametric oscillator is presented, yielding expressions for the quantum fluctuations of the output field intensities and phases. Particular emphasis is given to the study of the noise on the intensity difference between the two generated fields. The effect of losses, unbalance, detunings and excess pump noise is investigated. A significant quantum noise reduction is found over a broad domain of the parameter space.
It has been recently shown theoretically1 and experimentally2 that nondegenerate optical parametric oscillators generate above threshold intense and highly correlated twin beams. More precisely, the noise on the difference between the intensities of the two beams is well below the shot noise for noise frequencies inside the cavity bandwidth. An application of this quantum correlation is to measure the intensity of one beam and use this information to correct the fluctuations of the other beam by optoelectronic means (photodiode, amplifier, and electrooptic modulator). The correction may be applied either on the pumping beam (feedback correction) or directly on the twin beam itself (feed-forward correction).