We discuss the excitation of polaritons---strongly-coupled states of light and matter---by quantum light, instead of the usual laser or thermal excitation. As one illustration of the new horizons thus opened, we introduce Mollow spectroscopy, a theoretical concept for a spectroscopic technique that consists in scanning the output of resonance fluorescence onto an optical target, from which weak nonlinearities can be read with high precision even in strongly dissipative environments.
@article{arxiv.1505.07823,
title = {Exciting polaritons with quantum light},
author = {J. C. López Carreño and C. Sánchez Muñoz and D. Sanvitto and E. del Valle and F. P. Laussy},
journal= {arXiv preprint arXiv:1505.07823},
year = {2015}
}