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.
© 1988 Optical Society of America
Full Article | PDF ArticleMore Like This
Steven Kasapi, Seema Lathi, and Yoshihisa Yamamoto
J. Opt. Soc. Am. B 17(2) 275-279 (2000)
Mikhail I. Kolobov and Prem Kumar
Opt. Lett. 18(11) 849-851 (1993)
Boya Xie and Sheng Feng
Opt. Lett. 43(24) 6073-6076 (2018)