Past Events

Abstract

Spontaneous parametric down conversion has served as an excellent workhorse for proof-of-principle demonstrations of multi-photon entanglement and optical quantum computing. Yet, its probabilistic nature and higher-order photon emission limit the scalability in optical quantum information processing. Truly single photon sources based on semiconductor quantum dots offer distinct advantages including a scalable solid-state platform, ultrabrightness and interconnectivity with matter qubits. A key prerequisite for their use in optical quantum computing and solid-state quantum networks is a high level of indistinguishability. In this talk, I will present our recent experiments on generating deterministic, highly indistinguishable, robust and tunable single photons from a single quantum dot. The methods used include pulsed resonance fluorescence, adiabatic rapid passage, and spin-flip Raman scattering. Two-photon interference was observed from the same dot with an indistinguishablity up to 99.5% and remotes dots up to 87%. The intrinsic spin-photon correlation also allows the generation of Greenberger-Horne-Zeilinger-type spin-photon entanglement and deterministic quantum state transfer between single photons and single spins. Lastly, I will briefly present our recent experiment results on photon antibunching from defects in two-dimensional atomic layers.

Coffee and tea will be served 20 minutes prior to the seminar.