Javadi, A. Sollner, I. Arcari, M. Hansen, S. Lindskov Midolo, L. Mahmoodian, S. Kirsanske, G. Pregnolato, T. Lee, E. H. Song, J. D. Stobbe, S. Lodahl, P. 2024-01-20T06:02:25Z 2024-01-20T06:02:25Z 2021-09-05 2015-10 2041-1723 https://pubs.kist.re.kr/handle/201004/124941 Strong non-linear interactions between photons enable logic operations for both classical and quantum-information technology. Unfortunately, non-linear 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 used as a giant non-linearity sensitive at the single-photon level. The non-linear 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 non-linearity 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. English NATURE PUBLISHING GROUP TRAPPED ATOM COMPUTATION BLOCKADE CAVITY LIGHT FIBER GATE Single-photon non-linear optics with a quantum dot in a waveguide Article 10.1038/ncomms9655 1 NATURE COMMUNICATIONS, v.6 NATURE COMMUNICATIONS 6 scie scopus 000364935700002 2-s2.0-84944937079 Multidisciplinary Sciences Science & Technology - Other Topics Article TRAPPED ATOM COMPUTATION BLOCKADE CAVITY LIGHT FIBER GATE Single-photon quantum dot waveguide