We demonstrate all-optical switching based on a single quantum dot coupled to a photonic crystal cavity. The quantum-dot mediated interaction between the signal and control beams occurs at the single-photon level.

Conference on Lasers and Electro-OpticsJan 1, 20090 citations

Ultrafast Photon-Photon Interaction in a Strongly Coupled Quantum Dot-Cavity System

Dirk Englund, Arka Majumdar, Michal Bajcsy +3 more

We study dynamics of the interaction between two weak light beams mediated by a strongly coupled quantum dot-photonic crystal cavity system. First, we perform all-optical switching of a weak continuous-wave signal with a pulsed control beam, and then perform switching between two weak pulsed beams (40 ps pulses). Our results show that the quantum dot-nanocavity system enables fast, controllable optical switching at the single-photon level.

arXiv:1107.2956Physical Review LettersMar 2, 2012206 citations