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Area of Science:

  • Quantum communication
  • Solid-state physics
  • Nanophotonics

Background:

  • Single photon emitters are essential for quantum-secured communication.
  • Telecom-compatible wavelengths (1.31 μm) are required for long-haul optical networks.

Purpose of the Study:

  • To demonstrate high-purity single photon emission at 1.31 μm.
  • To evaluate the performance of quantum dot-based single photon sources.

Main Methods:

  • Utilized deterministically positioned InP photonic waveguide nanowires.
  • Incorporated single Indium Arsenide Phosphide (InAsP) quantum dots in a rod structure.
  • Measured single photon purity and collection efficiency.

Main Results:

  • Achieved high-purity single photon emission at 1.31 μm.
  • Obtained 27.6% collection efficiency with g(2)(0) = 0.021 at room temperature.
  • Observed increased multiphoton emission probability with rising temperature (0.11 at 77 K, 0.34 at 220 K, 0.57 at 300 K).

Conclusions:

  • Demonstrated a promising scalable approach for fabricating telecom single photon emitters.
  • Highlighted the potential for quantum sources operating under relaxed cooling conditions.
  • Attributed temperature dependence to broadened excitonic emission lines.