Squeezed Quantum Fluctuations and Noise Limits in Amplifiers and Attenuators
Authors:
- 1 June 1987
- journal article
- other
- Published by Taylor & Francis in Journal of Modern Optics
- Vol. 34 (6-7) , 949-963
Abstract
Conventional amplifiers add quantum noise to a signal. Both amplifiers and attenuators lead to a reduction of the signal-to-noise ratio. We find, however, that devices exhibiting squeezed fluctuations in the gain or loss medium lead to an improved signal-to-noise ratio, in one quadrature of the output, compared to the limits associated with conventional devices. We investigate amplifier and attenuator noise properties using a simple model in which the gain or loss medium is a broad-band reservoir in a specially prepared, or ‘rigged’, state.Keywords
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