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A process which strongly amplifies both quadrature amplitudes of anoscillatory signal necessarily adds noise. Alternatively, if the information inone quadrature is lost in phase-sensitive amplification, it is possible tocompletely reconstruct the other quadrature. Here we demonstrate such a nearlyperfect phase-sensitive measurement using a cavity optomechanical scheme,characterized by an extremely small noise less than 0.2 quanta. We also observemicrowave radiation strongly squeezed by 8 dB below vacuum. A source of brightsqueezed microwaves opens up applications in manipulations of quantum systems,and noiseless amplification can be used even at modest cryogenic temperatures.

Noiseless quantum measurement and squeezing of microwave fields utilizing mechanical vibrations