Understanding high gain twin beam sources using cascaded stimulated emission

TL;DR

This paper introduces a spectral characterization method for high gain pulsed twin beam sources using cascaded stimulated emission, enabling detailed analysis of high gain effects in parametric down conversion.

Contribution

The work presents a novel method for spectral characterization of high gain twin beam sources and demonstrates its effectiveness with experimental validation.

Findings

Accurate spectral characterization of high gain twin beams.

Good agreement between experimental data and theoretical predictions.

Potential for improving quantum source designs.

Abstract

We present a new method for the spectral characterization of pulsed twin beam sources in the high gain regime, using cascaded stimulated emission. We show an implementation of this method for a ppKTP spontaneous parametric down-conversion source generating up to 60 photon pairs per pulse, and demonstrate excellent agreement between our experiments and our theory. This work enables the complete and accurate experimental characterization of high gain effects in parametric down conversion, including self and cross-phase modulation. Moreover, our theory allows the exploration of designs with the goal of improving the specifications of twin beam sources for application in quantum information, computation, sampling, and metrology.