Structured Quantum Nanophotonics
Published:
Deterministic Quantum Light Sources
A key challenge in quantum computing is the generation of single photons on demand with high indistinguishability. Our research focuses on engineering the photonic environment of semiconductor quantum dots to address this.
We integrate GaAs quantum emitters with metasurfaces, dielectric nanocavities, and carrier-funneling nanostructures to control spontaneous emission, aiming for precise regulation of photon generation.
Enhanced Quantum Emitters
Metasurface-Enhanced Extraction ― We have demonstrated that metasurface integration can significantly enhance collection efficiency while preserving indistinguishability, which is critical for quantum communication.
Deterministic Brightness ― By utilizing graded-bandgap carrier funnels, we guide charge carriers to quantum dots, enhancing efficiency and delivering bright emission without degrading quantum properties.
Multi-Photon Generation ― We have engineered super-bunched trion cascades (XX⁺→2X⁺ transitions) to enable single quantum dots to emit three temporally ordered photons in a controlled sequence, relevant for on-chip cluster states.
Monolithic Quantum Circuits ― We are developing waveguide routers and integrated metalenses to direct photons into on-chip photonic circuits with low loss, enabling the coexistence of emitters and photonic logic on the same wafer.
Scalable Quantum Photonics
Our goal is to industrialize quantum photonics by co-designing emitters with their photonic environments. This approach supports the development of wafer-scale quantum chips with deterministic photon sources and addressable qubits.