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Noise-reduction in the nondegenerate parametric oscillator with direct detection feedback

By J. J. Slosser and G. J. Milburn


A quantum analysis of the above-threshold intensity fluctuations in a nondegenerate parametric oscillator with direct-detection feedback onto the pump amplitude is presented. We derive a master equation for the signal (in-loop) and idler (out-of-loop) modes by adiabatically eliminating the pump mode and incorporating a feedback term, using the Wiseman-Milburn quantum feedback theroy [Phys. Rev. Lett. 70, 548 (1993)]. In the absence of feedback and far above threshold, we find that both beams are 50% intensity squeezed. For small negative (positive) feedback, the intensity fluctuations in the out-of-loop (in-loop) beam are reduced further. For larger values of feedback, the fluctuations grow, the fields eventually becoming unsqueezed

Topics: Quantum-Theory, 3100 Physics and Astronomy, 3107 Atomic and Molecular Physics, and Optics
Publisher: American Physical Society
Year: 1994
DOI identifier: 10.1103/PhysRevA.50.793
OAI identifier:

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