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<p>Quantum dots have set benchmarks that far surpass other quantum emitters owing to their ability to deliver high-quality, high-rate and pure photons. However, achieving these exceptional capabilities at telecom wavelengths, bridging the gap to fibre-optic infrastructure and scalable silicon photonics, remains a challenge. Overcoming this difficulty demands high-quality quantum materials and devices that, despite extensive efforts, have not yet been realized. Here we demonstrate waveguide-integrated InAs quantum dots and realize a fully quantum-coherent photon–emitter interface operating in the original telecommunication band (or O-band, 1,260–1,360 nm). We record transform-limited linewidths only 8% broader than the inverse lifetime and bright 41.7-MHz emission rate under 80-MHz π-pulse excitation. These findings showcase the potential of quantum dots for scalable quantum networks.</p>

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A quantum-coherent photon–emitter interface in the original telecom band

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Marcus Albrechtsen,
  • Severin Krüger,
  • Juan C. Loredo,
  • Lucio Stefan,
  • Zhe Liu,
  • Yu Meng,
  • Lukas L. Niekamp,
  • Bianca F. Seyschab,
  • Nikolai Spitzer,
  • Richard J. Warburton,
  • Peter Lodahl,
  • Arne Ludwig,
  • Leonardo Midolo

摘要

Quantum dots have set benchmarks that far surpass other quantum emitters owing to their ability to deliver high-quality, high-rate and pure photons. However, achieving these exceptional capabilities at telecom wavelengths, bridging the gap to fibre-optic infrastructure and scalable silicon photonics, remains a challenge. Overcoming this difficulty demands high-quality quantum materials and devices that, despite extensive efforts, have not yet been realized. Here we demonstrate waveguide-integrated InAs quantum dots and realize a fully quantum-coherent photon–emitter interface operating in the original telecommunication band (or O-band, 1,260–1,360 nm). We record transform-limited linewidths only 8% broader than the inverse lifetime and bright 41.7-MHz emission rate under 80-MHz π-pulse excitation. These findings showcase the potential of quantum dots for scalable quantum networks.