Many-body cavity quantum electrodynamics with driven inhomogeneous emitters.

Area of Science:

• Quantum optics
• Cavity quantum electrodynamics (cQED)
• Solid-state physics

Background:

• Cavity quantum electrodynamics (cQED) systems with few emitters are well-studied.
• The dynamics of disordered, many-body quantum systems under strong driving are less explored.
• Such systems are crucial for quantum applications like qubits and transducers.

Purpose of the Study:

• Investigate the behavior of a large ensemble of inhomogeneously broadened solid-state emitters coupled to a nanophotonic resonator under strong excitation.
• Explore phenomena in the many-body cQED regime.

Main Methods:

• Studied a large, inhomogeneously broadened ensemble of solid-state emitters.
• Coupled emitters to a nanophotonic resonator with high cooperativity.
• Applied strong external excitation to the system.

Main Results:

• Discovered a sharp, collectively induced transparency (CIT) in the cavity reflection spectrum.
• Observed quantum interference and collective response driving the CIT.
• Demonstrated highly nonlinear optical emission, including superradiance and subradiance, within the CIT window.

Conclusions:

• The observed phenomena in the many-body cQED regime offer new pathways for slow light and frequency referencing.
• Findings pave the way for solid-state superradiant lasers.
• Results inform the development of ensemble-based quantum interconnects.