Narrowband heralded single photons via Bragg grating inscription in germanium-doped photonic crystal fiber

• URL: http://arxiv.org/abs/2603.09679v1
• Date: Tue, 10 Mar 2026 13:47:37 GMT
• Title: Narrowband heralded single photons via Bragg grating inscription in germanium-doped photonic crystal fiber
• Abstract summary: We present a fiber-based source of narrowband heralded single photons in the telecoms C-band.<n>We present photon counting data with a coincidence-to-accidental ratio of up to 70.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a fiber-based source of narrowband heralded single photons in the telecoms C-band. Photon pairs were generated by spontaneous four-wave mixing in photonic crystal fiber (PCF) with a germanium-doped region incorporated into its core for enhanced photosensitivity. A fiber Bragg grating (FBG) with a bandwidth of 0.2 nm and contrast of 17.5 dB was UV-written into the PCF to reflect a sub-nanometre slice of the photon-pair spectrum. This allowed narrowband photons to be heralded at the proximal end of the fiber by detection events after the distal end. We present photon counting data with a coincidence-to-accidental ratio of up to 70. Our source demonstrates a viable route to fiber-integrated narrowband heralded single photon sources suitable for coupling to quantum memories and interfacing heterogeneous qubit types.

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