Ensemble-Induced Strong Light-Matter Coupling of a Single Quantum Emitter

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.