Intensity noise reduction of twin beams by a passive semiconductor medium

A passive optical system is proposed to explore the intensity quantum corre lation of two twin beams to reduce the photon noise of one of them. It cons ists of using a semiconductor medium inside an optical cavity, which behave s as a nonlinear medium presenting a crossed Kerr effect. The intensity flu ctuations of one beam modify the resonance condition of the cavity for the other beam and therefore its intensity. The medium is described microscopic ally within the two-level atom model. It is shown that, under typical exper imental conditions, this system may produce noise reduction.