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We developed a scalable method to integrate single-photon sources into photonic circuits using 2D semiconductors. This breakthrough enables on-chip quantum technologies by efficiently coupling single photons from tungsten diselenide waveguides.

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Area of Science:

  • Quantum Technologies
  • Materials Science
  • Nanophotonics

Background:

  • Efficient on-chip integration of single-photon emitters is crucial for quantum technologies but faces scalability challenges.
  • Current methods of placing individual emitters in photonic integrated circuits are costly and inefficient.
  • Two-dimensional (2D) semiconductors offer a promising scalable platform, but on-chip resonant excitation and emission remain difficult.

Purpose of the Study:

  • To demonstrate a scalable approach for integrating single-photon emitters into silicon nitride photonic waveguides.
  • To achieve simultaneous strain-localization and waveguide coupling of single-photon emitters from 2D materials.
  • To enable on-chip resonant excitation and guiding of single photons for quantum applications.

Main Methods:

  • Utilizing a silicon nitride photonic waveguide to create strain-localized single-photon emitters from a tungsten diselenide (WSe2) monolayer.
  • Coupling the emitters into the waveguide mode for efficient photon guiding.
  • Performing on-chip resonant excitation and measuring the second-order autocorrelation function (g(2)(0)) to verify single-photon emission.

Main Results:

  • Demonstrated successful guiding of single photons within the photonic circuit with g(2)(0) = 0.150 ± 0.093.
  • Achieved on-chip resonant excitation of the emitters, resulting in g(2)(0) = 0.377 ± 0.081.
  • Showcased a scalable method for integrating high-quality single-photon sources.

Conclusions:

  • This work presents a scalable platform for on-chip quantum light sources using 2D materials.
  • The demonstrated technique facilitates coherent control of quantum states and multiplexing of single photons.
  • The findings represent a significant advancement towards practical photonic quantum circuits.