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Area of Science:

  • Quantum physics
  • Cavity quantum electrodynamics
  • Solid-state quantum emitters

Background:

  • Strong coupling of quantum emitters to optical cavities is crucial for quantum technologies.
  • Existing methods often face challenges with scalability or precise control.
  • Ensemble-based approaches typically lead to collective, not single-emitter, strong coupling.

Purpose of the Study:

  • To present a novel technique for achieving strong coupling of a single quantum emitter to a cavity mode.
  • To explore the generation of strong photon nonlinearities and polariton formation.
  • To provide a feasible experimental pathway using realistic parameters.

Main Methods:

  • Utilizing virtual excitations of a mesoscopic ensemble of emitters to mediate coupling.
  • Engineering coherent and dissipative dipolar interactions between the ensemble and the target emitter.
  • Analyzing the resulting collective coupling to the cavity and target emitter.

Main Results:

  • Demonstrated strong coupling at the single-emitter level.
  • Induced strong photon nonlinearities and polariton formation.
  • Proposed a practical implementation using silicon-vacancy (SiV-) defects in diamond.

Conclusions:

  • The proposed technique offers a robust method for single-emitter strong coupling.
  • This approach overcomes limitations of conventional ensemble strong coupling schemes.
  • Potential applications include quantum information processing and cavity-assisted quantum chemistry.