Quantum Noise Reduction Using a Nonlinear Sagnac Loop with Positive Dispersion
Recent experiments at MIT using light from a mode-locked Nd:YLF laser at 1.3µm in a fiber Sagnac loop have achieved noise levels 5.1dB below shot noise. In these experiments, squeezing is limited by the gaussian shape of the pump pulses. We show that by operating the interferometer away from 1.3µm that limitation can be overcome. For these wavelengths the group velocity dispersion of silica fibers creates negative correlations between the noise on different parts of the pump.
KeywordsPump Pulse Quantum Noise Local Oscillator Group Velocity Dispersion Sagnac Interferometer
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- M. Xiao Opt. Lett. 13, 476 (1988)Google Scholar