title: Detection of amplitude modulation with squeezed light for sensitivity beyond the shot-noise limit.
abstract: An improvement in precision beyond the limit set by the vacuum-state or zero-point fluctuations of the electromagnetic field is reported for the detection of amplitude modulation encoded on a weak signal beam. The improvement is achieved by employing the squeezed light from an optical parametric oscillator to reduce the level of fluctuations below the shot-noise limit. An increase in signal-to-noise ratio of 2.5 dB relative to the shot-noise limit is demonstrated.
authors.forename: M
authors.initials: M
authors.lastname: Xiao
authors.forename: L A
authors.initials: LA
authors.lastname: Wu
authors.forename: H J
authors.initials: HJ
authors.lastname: Kimble