USES FOR SQUEEZED COHERENT RADIATION.

The Random deletion noise, generated when photons are absorbed by a lossy medium, rapidly degrades squeezing. Consequently squeezed light is most likely to find applications in optical systems where the overall loss L is low, that is, where most of the photons generated at the squeezed-state source arrive at the detector. In an optical system where 90% of the photons emitted by a squeezed-state source are registered by the detector, one requires an order of magnitude more power to achieve the same sensitivity using coherent light. Application of this figure of merit is complicated by the fact that for an optical system using coherent states, sensitivity can often be increased by increasing L to 0. 5 or larger. In such conditions, where L is chosen to optimize the sensitivity, the advantage to be gained by using squeezed states can become insignificant. For squeezed states to be useful, not only must the loss L be small, but it must be small for good reason. For a number of optical systems, including interferometers and spectrometers, power constraints, bandwidths, or other considerations dictate that the overall loss should be small and thus squeezed states can do some good. There are also conditions in which squeezed states are likely to be useful in communications systems.