Two-color narrowband photon pair source with high brightness based on clustering in a monolithic waveguide resonator

TL;DR

This paper presents a compact, high-brightness, two-color narrowband photon pair source based on clustering in a monolithic waveguide resonator, suitable for quantum communication applications.

Contribution

It introduces a novel integrated waveguide resonator design that achieves high brightness and spectral clustering for efficient photon pair generation.

Findings

Achieved a brightness of 3×10^3 pairs/(s·mW·MHz).

Produced narrowband photon pairs at 890 nm and 1320 nm.

Demonstrated a compact, rugged, monolithic device.

Abstract

We report on an integrated non-degenerate narrowband photon pair source produced at 890 nm and 1320nm via type II parametric down-conversion in a periodically poled waveguide with high-reflective dielectric mirrors deposited on the waveguide end faces. The conversion spectrum consists of three clusters and only 3 to 4 longitudinal modes with about 150 MHz bandwidth in each cluster. The high conversion efficiency in the waveguide, together with the spectral clustering in the double resonator, leads to a high brightness of $3\times10^3~$pairs/(s$\cdot$mW$\cdot$MHz). The compact and rugged monolithic design makes the source a versatile device for various applications in quantum communication.