Generation of indistinguishable and pure heralded single photons with tunable bandwidth

TL;DR

This paper introduces a versatile scheme for generating pure, indistinguishable, and tunable-bandwidth photon pairs via spontaneous parametric down-conversion, applicable across various nonlinear crystals and frequency ranges.

Contribution

A novel, broadly applicable method to control the joint spectrum of photon pairs, enabling customizable bandwidth and spectral purity in quantum optics applications.

Findings

Successfully generates frequency-uncorrelated photon pairs

Achieves tunable bandwidth for photon pairs

Applicable to any nonlinear crystal and frequency band

Abstract

We describe a new scheme to fully control the joint spectrum of paired photons generated in spontaneous parametric down-conversion. We show the capability of this method to generate frequency-uncorrelated photon pairs that are pure and indistinguishable, and whose bandwidth can be readily tuned. Importantly, the scheme we propose here can be implemented in any nonlinear crystal and frequency band of interest.