Generation of nondegenerate narrow-band photon pairs for hybrid quantum network

TL;DR

This paper presents a novel cavity-enhanced method to generate nondegenerate narrow-band photon pairs with independently tunable frequencies and bandwidths, suitable for linking diverse quantum nodes in hybrid quantum networks.

Contribution

It introduces a conjoined double-cavity strategy for producing photon pairs with independently adjustable frequencies and bandwidths, matching different quantum nodes.

Findings

Achieved 4 MHz bandwidth at 935 nm and 5 MHz at 880 nm.

Normalized spectrum brightness of 4.9/s/MHz/mW.

Demonstrated universal suitability for hybrid quantum networks.

Abstract

In a hybrid quantum network, linking two kinds of quantum nodes through photonic channels requires excellent matching of central frequency and bandwidth between both nodes and their interfacing photons. However, pre-existing photon sources can not fulfill this requirement. Using a novel conjoined double-cavity strategy, we report the generation of nondegenerate narrow-band photon pairs by cavity-enhanced spontaneous parametric down-conversion. The central frequencies and bandwidths of the signal and idler photons are independently set to match with trapped ions and solid-state quantum memories. With this source we achieve the bandwidths and central frequencies of 4 MHz at 935 nm and 5 MHz at 880 nm for the signal and idler photons respectively, with a normalized spectrum brightness of 4.9/s/MHz/mW. Due to the ability of being independently locked to two different wavelenghts, the conjoined double-cavity is universally suitable for hybrid quantum network consisting of various quantum nodes.