Multiphoton probing of complex quantum emitters

Controlling the interaction between single quantum emitters and single photons in nanophotonic environments is routinely achieved in many labs around the world. Nevertheless, the characterization of those interactions is typically limited to measure single-photon transmission, second order correlations, or pump-probe experiments. Developing more sophisticated two- or multi-photon probing protocols [1] can allow us, for instance, to quantify complex photon-photon interactions and correlations induced by quantum emitters [2] or to characterize the operation of nonlinear nanophotonic devices.

In this talk, I will introduce a great simplification of the original multiphoton scattering tomography method [1] so that its application now only requires weak monochromatic coherent state inputs and standard homodyne or photo-detection methods at the output. Despite the simplicity of this new approach, I will show that it can be used to characterize general two- and multi-photon interactions and to probe complex quantum emitters even in the presence of a noisy nanophotonic environment.

[1] T. Ramos, J.J. García-Ripoll, “Multiphoton Scattering Tomography with Coherent States”, Phys. Rev. Lett. 109, 153601 (2017).

[2] H. Le Jeannic, T. Ramos, S.F. Simonsen, T. Pregnolato, Z. Liu, R. Schott, A.D. Wieck, A. Ludwig, N. Rotenberg, J.J. García-Ripoll, and P. Lodahl, “Experimental reconstruction of the few-photon nonlinear scattering matrix from a single quantum dot in a nanophotonic waveguide”, Phys. Rev. Lett. 126, 023603 (2021).