Rd. Li et al., GAUSSIAN-WAVE THEORY OF SUB-POISSONIAN LIGHT GENERATION BY MEANS OF TRAVELING-WAVE PARAMETRIC DEAMPLIFICATION, Quantum and semiclassical optics, 7(4), 1995, pp. 705-713
A Gaussian-wave theory is developed to analyse the sub-Poissonian ligh
t generated by means of travelling-wave optical parametric deamplifica
tion. The Gaussian spatial profile of the pump beam limits the observa
ble Fano factor to -3 dB (0.5). Gain-induced diffraction of the signal
beam and classical fluctuations of the pump-signal relative phase cau
se further degradation. The theory is compared with our recent experim
ental results, and excellent agreement is found after the effect of no
n-ideal photodetection efficiency is taken into account.