Characterizing heralded single photons with an all-fiber source of photon pairs

TL;DR

This paper combines theoretical modeling and experimental validation to characterize a fiber-based heralded single photon source, analyzing key metrics like $g_c^{(2)}(0)$ and heralding efficiency for quantum information applications.

Contribution

It provides a comprehensive theoretical and experimental analysis of a fiber-based heralded single photon source, aiding optimization for quantum information processing.

Findings

Experimental results match theoretical predictions.

Optimized source parameters improve single photon quality.

Characterized key metrics like $g_c^{(2)}(0)$ and heralding efficiency.

Abstract

Based on the signal and idler photon pairs produced in a piece of high nonlinear fiber by a pulsed pump, we characterize the heralded single photon source from both the theoretical and experimental aspects. In the theory model, started from the derived expression of Bogoliubov transformation for a broadband pulsed pump, the second-order intensity correlation function $g_c^{(2)}(0)$, heralding efficiency $H$, indistinguishability and brightness of the heralded single photons as a function of source parameters are analyzed and discussed. In the experiments, using several kinds of combinations of the source parameters, the values of $g_c^{(2)}(0)$ and $H$ are measured and compared. The experimental results are consistent with the theoretical predictions. The investigations are useful for optimizing the parameters and for developing a single photon source suitable for quantum information processing.