Abstract
We used a spatially broadband optical parametric amplifier for image amplification. In the phase-sensitive configuration of the amplifier, we observed noiseless amplification of input images. For a gain of , we measured noise-figure values of ( ) and ( ) dB, respectively, for two amplifiers of different lengths. These experimental values agree with theory (for an ideal noiseless amplifier the noise figure is 0 dB) and are almost 2 dB lower than the quantum limit of an ideal phase-insensitive amplifier.
- Received 24 March 1999
DOI:https://doi.org/10.1103/PhysRevLett.83.1938
©1999 American Physical Society