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PreprintCC BY 4.0arXiv

A Fibre-Integrated SPDC Heralded Single-Photon Source Using Zn-Indiffused PPLN Ridge Waveguides at Telecom Wavelengths

  • Peter Iveson
  • Paolo L. Mennea
  • Goronwy Tawy
  • Rex H. S. Bannerman
  • Noe Palomar-Davidson
  • Greg Blanchard-Emmerson
  • Patrick M. Ledingham
  • Peter G. R. Smith
  • James C. Gates
  • Corin B. E. Gawith
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Abstract

We demonstrate a fully fibre-integrated source of broadband polarisation-entangled photon pairs at telecom wavelengths based on a commercially available Zn-indiffused MgO:PPLN ridge waveguide incorporated within a Sagnac interferometer. Operating across the full degenerate SPDC spectrum using pump-suppression filtering only, the source exhibits a measured bandwidth of approximately 67 nm. Strong non-classical correlations are observed, with an average two-photon interference visibility of 96.9 +/- 0.2 %, a fidelity to the Phi + Bell state of 78.1 %, and a CHSH Bell parameter of S = 2.501 +/- 0.005. We further explore the effect of increasing source brightness on Bell-state performance, revealing the limitations of accidental-corrected metrics in high-flux operating regimes.

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Cite

BibTeXRIS
BibTeX
@misc{iveson2026fibreintegrated,
  title = {{A Fibre-Integrated SPDC Heralded Single-Photon Source Using Zn-Indiffused PPLN Ridge Waveguides at Telecom Wavelengths}},
  author = {Peter Iveson and Paolo L. Mennea and Goronwy Tawy and Rex H. S. Bannerman and Noe Palomar-Davidson and Greg Blanchard-Emmerson and Patrick M. Ledingham and Peter G. R. Smith and James C. Gates and Corin B. E. Gawith},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.23499},
  eprint = {2610.23499},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.23499},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - A Fibre-Integrated SPDC Heralded Single-Photon Source Using Zn-Indiffused PPLN Ridge Waveguides at Telecom Wavelengths
AU  - Peter Iveson
AU  - Paolo L. Mennea
AU  - Goronwy Tawy
AU  - Rex H. S. Bannerman
AU  - Noe Palomar-Davidson
AU  - Greg Blanchard-Emmerson
AU  - Patrick M. Ledingham
AU  - Peter G. R. Smith
AU  - James C. Gates
AU  - Corin B. E. Gawith
PY  - 2026
DA  - 2026/10/16
PB  - arXiv
DO  - 10.48550/arxiv.2610.23499
UR  - https://arxiv.org/abs/2610.23499
AB  - We demonstrate a fully fibre-integrated source of broadband polarisation-entangled photon pairs at telecom wavelengths based on a commercially available Zn-indiffused MgO:PPLN ridge waveguide incorporated within a Sagnac interferometer. Operating across the full degenerate SPDC spectrum using pump-suppression filtering only, the source exhibits a measured bandwidth of approximately 67 nm. Strong non-classical correlations are observed, with an average two-photon interference visibility of 96.9 +/- 0.2 %, a fidelity to the Phi + Bell state of 78.1 %, and a CHSH Bell parameter of S = 2.501 +/- 0.005. We further explore the effect of increasing source brightness on Bell-state performance, revealing the limitations of accidental-corrected metrics in high-flux operating regimes.
ER  -