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On-Chip Waveguide Coupling of a Layered Semiconductor Single-Photon Source.

Philipp Tonndorf1, Osvaldo Del Pozo-Zamudio1, Nico Gruhler1

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Summary

Researchers developed new on-chip single-photon sources using gallium selenide. These integrated sources are crucial for scalable quantum technology, enabling efficient light coupling directly onto photonic chips.

Keywords:
GaSeSingle-photon sourcelayered materialon-chip waveguiding

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Area of Science:

  • Quantum technology
  • Photonics
  • Materials science

Background:

  • Integrated quantum technology requires on-chip single-photon sources, processing units, and detectors for scalability and performance.
  • Current integrated quantum circuits and detectors show progress, but on-chip single-photon sources are limited.
  • Nonclassical light is typically coupled externally to photonic chips due to the scarcity of integrated sources.

Purpose of the Study:

  • To present waveguide-coupled single-photon emitters based on gallium selenide (GaSe) as on-chip sources for integrated quantum technology.
  • To demonstrate efficient light coupling and nonclassical photon generation from GaSe emitters integrated with silicon nitride waveguides.

Main Methods:

  • Fabrication of thin gallium selenide (GaSe) crystals (thickness < 100 nm).
  • Integration of GaSe crystals onto silicon nitride (Si3N4) rib or slot waveguides.
  • Optical excitation of GaSe emitters using light coupled within the Si3N4 waveguide.

Main Results:

  • Achieved efficient light coupling between GaSe emitters and Si3N4 waveguides.
  • Demonstrated nonclassicality of photons generated by the integrated GaSe sources.
  • Confirmed successful routing of generated photons on the photonic chip.

Conclusions:

  • Gallium selenide is a promising material for developing on-chip single-photon sources.
  • The presented method offers an easy-to-implement and robust approach for integrated quantum light sources.
  • This work advances the development of fully integrated quantum technology by providing essential on-chip photon emitters.