%0 Journal Article
%T Single-photon nonlinear optics with a quantum dot in a waveguide
%A A. Javadi
%A I. S£¿llner
%A M. Arcari
%A S. L. Hansen
%A L. Midolo
%A S. Mahmoodian
%A G. Kir£¿ansk£¿
%A T. Pregnolato
%A E. H. Lee
%A J. D. Song
%A S. Stobbe
%A P. Lodahl
%J Physics
%D 2015
%I arXiv
%X Strong nonlinear interactions between photons enable logic operations for both classical and quantum-information technology. Unfortunately, nonlinear interactions are usually feeble and therefore all-optical logic gates tend to be inefficient. A quantum emitter deterministically coupled to a propagating mode fundamentally changes the situation, since each photon inevitably interacts with the emitter, and highly correlated many-photon states may be created . Here we show that a single quantum dot in a photonic-crystal waveguide can be utilized as a giant nonlinearity sensitive at the single-photon level. The nonlinear response is revealed from the intensity and quantum statistics of the scattered photons, and contains contributions from an entangled photon-photon bound state. The quantum nonlinearity will find immediate applications for deterministic Bell-state measurements and single-photon transistors and paves the way to scalable waveguide-based photonic quantum-computing architectures.
%U http://arxiv.org/abs/1504.06895v1