We consider dispersive optical bistability with nonclassical driving field from a sub-Poissonian laser. The bistable system consists of an optical cavity filled with a resonant atomic medium. We calculate analytically the photocurrent noise spectrum at the output of the bistable system and find complete noise reduction close to the upper turning point of the bistability curve. This proves a possibility of using nonclassical light in optical bistability without destructing its quantum statistics.

• Received 22 November 1996

DOI:https://doi.org/10.1103/PhysRevLett.79.399