OPTICAL BLOCH EQUATIONS IN THE PRESENCE OF STOCHASTIC BROAD-BAND VACUUM

The atomic Bloch equations driven by a quantum noise are investigated in the framework of c-number multiplicative stochastic Rabi amplitudes . It is shown that the stochastic broad-band vacuum fluctuations can b e incorporated in such a way that spontaneous absorption is removed. I t is shown that the multiplicative stochastic noise with no spontaneou s absorption is equivalent to the quantum vacuum noise. A stochastic m odel of the broad-band squeezed vacuum is introduced and investigated. From such a stochastic description the fast and the slow damping rate s of the Bloch polarizations are obtained. The strong-field resonance fluorescence spectrum and the steady-state atomic inversion for the st ochastic model of squeezed vacuum fluctuations are derived.