Abstract
We show that it is possible to amplify a beam of light in such a way that less noise is added to the beam than would be added by a quantum-noise-limited amplifier. This result can be interpreted in terms of a filtering mechanism that makes it possible to reduce the effective noise bandwidth of the amplifier.
- Received 12 November 1992
DOI:https://doi.org/10.1103/PhysRevA.47.4297
©1993 American Physical Society