Meta-cavity Quantum Electrodynamics

TL;DR

This paper introduces a novel semiconductor quantum dot system embedded in geometric-phase metacavities that simultaneously enhances emission and allows customizable wavefront control, advancing quantum light source technology.

Contribution

It demonstrates a new approach to combine Purcell enhancement with wavefront shaping in a single, ultra-thin monolithic device using geometric-phase metasurfaces.

Findings

Achieved triggered single-photon emission with customizable wavefronts.

Demonstrated high Purcell enhancement and complex wavefront control.

Established a new paradigm for integrated quantum light sources.

Abstract

Cavity quantum electrodynamics (cQED) harnesses light-matter interactions to produce nonclassical light states. However, a fundamental challenge lies in simultaneously achieving Purcell enhancement and tailored wavefront control within a single cavity, due to conflicting resonator requirements. Here, we overcome this limitation by demonstrating triggered single-photon emission with customizable wavefronts from semiconductor quantum dots embedded in geometric-phase metacavities. These monolithic devices - only 200 nm thick - deliver Purcell-enhanced emission alongside spin-momentum-locked radiation, vortex beams, and holographic patterns. The meta-atom lattice provides high-Q optical confinement, while spatially modulated orientations enable efficient outcoupling of photons with designed states. This work establishes a new paradigm for intrinsically multiplexing metasurface-based wavefront shaping with cQED, enabling high-performance quantum light sources from subwavelength-scale monolithic platforms.