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

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)20379-20395
Number of pages17
JournalOptics Express
Issue number16
Early online date26 Jul 2018
DateAccepted/In press - 25 Jun 2018
DateE-pub ahead of print - 26 Jul 2018
DatePublished (current) - 6 Aug 2018


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.

    Research areas

  • Quantum optics, Integrated optics, Nonlinear optics

    Structured keywords

  • QETLabs

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    Licence: CC BY


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