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Area of Science:

  • Quantum Information Science
  • Materials Science
  • Nanophotonics

Background:

  • Spin-active optical emitters in silicon carbide (SiC) are promising for scalable quantum technologies.
  • Challenges include inefficient photon collection due to undirected emission and low total internal reflection angles in SiC.

Purpose of the Study:

  • To comprehensively study nanophotonic waveguide-to-fiber interfaces in SiC.
  • To enhance photon collection efficiency and explore applications in quantum networks.

Main Methods:

  • Fabrication and characterization of SiC nanophotonic waveguides.
  • Integration of silicon vacancy (SiV) color centers into SiC waveguides.
  • Measurement of photon collection efficiency, count rates, spin state shifts, and spin coherence times.

Main Results:

  • Experimental collection efficiencies consistently exceeded 90% across various fabrication parameters.
  • Integrated SiV color centers achieved a photon count rate of 181 kcps, an order of magnitude higher than standard setups.
  • Coherent electron spin manipulation demonstrated state-of-the-art coherence times (T2 ~ 42 μs).

Conclusions:

  • Nanophotonic waveguide interfaces significantly improve photon collection in SiC for quantum applications.
  • The demonstrated methods are robust and scalable for building quantum networks with multiple emitters.