On-chip quantum interference with heralded photons from two independent micro-ring resonator sources in silicon photonics

Imad I. Faruque*, Gary F. Sinclair, Damien Bonneau, John G. Rarity, Mark G. Thompson

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

17 Citations (Scopus)
258 Downloads (Pure)


High visibility on-chip quantum interference among indistinguishable single-photons from multiples sources is a key prerequisite for integrated linear optical quantum computing. Resonant enhancement in micro-ring resonators naturally enables brighter, purer and more indistinguishable single-photon production without any tight spectral filtering. The indistinguishability of heralded single-photons from multiple micro-ring resonators has not been measured in any photonic platform. Here, we report on-chip indistinguishability measurements of heralded single-photons generated from independent micro-ring resonators by using an on-chip Mach-Zehnder interferometer and spectral demultiplexer. We measured the raw heralded two-photon interference fringe visibility as 72 ± 3%. This result agrees with our model, which includes device imperfections, spectral impurity and multi-pair emissions. We identify multi-pair emissions as the main factor limiting the nonclassical interference visibility, and show a route towards achieving near unity visibility in future experiments.

Original languageEnglish
Pages (from-to)20379-20395
Number of pages17
JournalOptics Express
Issue number16
Early online date26 Jul 2018
Publication statusPublished - 6 Aug 2018

Structured keywords

  • QETLabs


  • Quantum optics
  • Integrated optics
  • Nonlinear optics

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  • Projects

    Programme Grant: Engineering Photonic Quantum Technologies.

    Rarity, J. G., O'Brien, J. L., Thompson, M. G., Erven, C., Sahin, D., Marshall, G. D., Barreto, J., Jiang, P., Mccutcheon, W. D., Silverstone, J. W., Sinclair, G. F., Kling, L., Banerjee, A., Wang, J., Santagati, R., Borghi, M., Woodland, E. M., Mawdsley, H. C. M. & Faruque, I. I.


    Project: Research, Parent


    O'Brien, J. L.


    Project: Research, Parent

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