Topologically-Protected Single-Photon Sources with Topological Slow Light Photonic Crystal Waveguides

Kazuhiro Kuruma, Hironobu Yoshimi, Yasutomo Ota, Ryota Katsumi, Masahiro Kakuda, Yasuhiko Arakawa, Satoshi Iwamoto

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Slow light waveguides are advantageous for implementing high-performance single-photon sources required for scalable operation of integrated quantum photonic circuits (IQPCs), though such waveguides are known to suffer from propagation loss due to backscattering. A way to overcome the drawback is to use topological photonics, in which robust waveguiding in topologically-protected optical modes has recently been demonstrated. Here, single-photon sources are reported using single quantum dots (QDs) embedded in topological slow light waveguides based on valley photonic crystals. Purcell-enhanced single-photon emission is demonstrated from a QD into a topological slow light mode with a group index over 20 and its robust propagation even under the presence of sharp bends. These results pave the way for the realization of robust and high-performance single-photon sources indispensable for IQPCs.

Original languageEnglish
Article number2200077
JournalLaser and Photonics Reviews
Issue number8
Publication statusPublished - 2022 Aug


  • photonic crystals
  • quantum dots
  • single-photon sources
  • topological photonics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


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