Single-photon source with sub-MHz linewidth for cesium-based quantum information processing

Abstract

A single-photon source with narrow bandwidth, high purity, and large brightness can efficiently interact with material qubits strongly coupled to an optical microcavity for quantum information processing. Here, we experimentally demonstrate a degenerate doubly resonant single-photon source at 852 nm by the cavity-enhanced spontaneous parametric downconversion process with a 100% duty cycle of generation. The single photon source possesses both high purity with a second-order correlation g_h^{\left(2\right)}\left(0\right)=0.021 and narrow linewidth with \mathrm{\Delta }{\nu }_{sp}=\left(800\pm 13\right)\text{kHz}. The single-photon source is compatible with the cesium atom D2 line and can be used for cesium-based quantum information processing.

Graphical abstract

Keywords

single-photon source / sub-MHz linewidth / few longitudinal modes / quantum information processing

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Declarations

The authors declare that they have no competing interests and there are no conflicts.

Availability of data and material

The data that support the findings of this study are available from the corresponding author, upon reasonable request.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11974223, and 11974225), and the Fund for Shanxi 1331 Project Key Subjects Construction.

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