Statistics of twin-beam states by photon-number resolving detectors up to pump depletion

• DOI: 10.1364/josab.31.000b14
• Publication Date: 2014-08-19T15:56:50Z
• Authors: Alessia Allevi; Maria Bondani
• Keywords: Signal beam; SIGNAL (programming language)

We use hybrid photodetectors endowed with partial photon-number resolution to characterize the distribution of twin-beam states produced at different intensity regimes up pump depletion. To match detectors' dynamics, light signal and idler is strongly attenuated by neutral-density filters. Since filters do not modify nature any classical-light statistics, we find that are described a multimode thermal power. The number modes decreases increasing power until depletion, when starts again. effect qualitatively interpreted as selective mode amplification induced high-gain parametric process.