Coherent photon-emitter interfaces offer a way to mediate efficient nonlinear photon-photon interactions, much needed for quantum information processing. Here we experimentally study the case of a two-level emitter, a quantum dot, coupled to a single optical mode in a nanophotonic waveguide. We carry out few-photon transport experiments and record the statistics of the light to reconstruct the scattering matrix elements of 1- and 2-photon components. This provides direct insight to the complex nonlinear photon interaction that contains rich many-body physics.
@article{arxiv.2006.00258,
title = {Experimental reconstruction of the few-photon nonlinear scattering matrix from a single quantum dot in a nanophotonic waveguide},
author = {Hanna Le Jeannic and Tomás Ramos and Signe F. Simonsen and Tommaso Pregnolato and Zhe Liu and Rüdiger Schott and Andreas D. Wieck and Arne Ludwig and Nir Rotenberg and Juan José García-Ripoll and Peter Lodahl},
journal= {arXiv preprint arXiv:2006.00258},
year = {2021}
}