Narrowband heralded single photons via Bragg grating inscription in germanium-doped photonic crystal fiber
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866917329776934912 |
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| author | Smith, Will A. M. Flint, Alex I. Bannerman, Rex H. S. Gates, James C. Smith, Peter G. R. Davis, Alex O. C. Mosley, Peter J. |
| author_facet | Smith, Will A. M. Flint, Alex I. Bannerman, Rex H. S. Gates, James C. Smith, Peter G. R. Davis, Alex O. C. Mosley, Peter J. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_09679 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Narrowband heralded single photons via Bragg grating inscription in germanium-doped photonic crystal fiber Smith, Will A. M. Flint, Alex I. Bannerman, Rex H. S. Gates, James C. Smith, Peter G. R. Davis, Alex O. C. Mosley, Peter J. Quantum Physics 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. |
| title | Narrowband heralded single photons via Bragg grating inscription in germanium-doped photonic crystal fiber |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.09679 |