Research

We are interested in generating single photons and quantum states of photons for quantum communication and sensing. III-V quantum dots are ideal photon emitters with near-unity quantum efficiency and fast radiative emission (Γ > 1 GHz). We use various nanostructures and microstructures to enhance photon collection from quantum dots. We are particularly interested in using the spin state of electrons in quantum dots for entangled photon generation.

We explore the spin state of color centers in wide-bandgap materials such as SiC and other novel crystals for applications in quantum-enhanced sensing and communication. We are particularly interested in developing quantum emitters with enhanced spin coherence. 

In this work, we used a quantum dot in an open microcavity to generate single photons. We achieved an efficiency of 57% at the end of a single-mode optical fiber. We also demonstrated that photons sequentially generated by this source are identical, or indistinguishable in technical terms.

Refs: Nat. Nanotechnol. 16, 399 (2021).

We are interested in using photonic nanostructures to engineer the interaction between solid-state quantum emitters and optical photons. We use photonic nanostructures for this purpose. In this work, we showed that interaction between a quantum dot and photons can be tailored to near-unity levels. Such a strong interaction results in interaction between single photons.
Refs: Nat. Commun. 6, 8655 (2015).