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Area of Science:

  • Quantum computing
  • Solid-state physics
  • Photonics

Background:

  • Superconductor-semiconductor hybrid devices offer enhanced scalability and robustness for quantum systems.
  • Superconducting light-emitting diodes (SLEDs) are theoretically predicted to emit polarization-entangled photon pairs via Cooper pair recombination.

Purpose of the Study:

  • To experimentally demonstrate two-photon emission from a GaAs/AlGaAs SLED.
  • To investigate the temperature-dependent characteristics of photon emission in SLEDs.

Main Methods:

  • Fabrication and characterization of a GaAs/AlGaAs SLED.
  • Measurement of electroluminescence spectra below the critical temperature (Tc).
  • Temperature-dependent photon-pair correlation experiments (g(2)(τ,T)).

Main Results:

  • Observed unique two-photon superconducting features in electroluminescence spectra below Tc.
  • Demonstrated temperature-dependent time coincidences between emitted photons below Tc.
  • Confirmed experimental evidence for two-photon emission in SLEDs.

Conclusions:

  • The experimental demonstration of two-photon emission in SLEDs is a significant advancement for quantum technologies.
  • These findings open new avenues for developing compact and efficient superconducting quantum light sources.
  • The study advances the understanding of light-matter interactions in hybrid quantum systems.