Compact and efficient quantum frequency conversion of a fiber-pigtailed single-photon source

Journal article

Quantum frequency converters are key enabling technologies in photonic quantum information science to bridge the gap between quantum emitters and telecom photons. Here, we report a coherent frequency converter scheme combining a fiber-coupled nonlinear optical lithium niobate waveguide with a fiber-pigtailed single-photon source based on semiconductor quantum dots. Single and indistinguishable photons are converted from 925.7 nm to the telecommunication C-band, with a 48.4% end-to-end efficiency and full preservation of single-photon purity and indistinguishability. The integration of the two fiber-based modules achieving top-level performance represents an important step toward the practical interconnection of future quantum information processing systems operating at different wavelengths.

Authors: Cohen, M; Martin, A; Dalidet, R; Pastier, F; Billard, M

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: AIP Publishing
• Journal: APL Quantum
• Volume: 3
• Issue: 1
• Article number: 16101
• Publication date: 2026-01-02
• Acceptance date: 2025-12-07
• DOI: 10.1063/5.0292682
• EISSN: 2835-0103
• Language: English