In one-dimensional optical setups, light-matter interaction is drastically enhanced by the interference between the incident and scattered fields. Particularly, in the impedance-matched \Lambda-type three-level systems, a single photon deterministically induces the Raman transition and switches the electronic state of the system. Here we show that such a \Lambda system can be implemented by using dressed states of a driven superconducting qubit and a resonator. The input microwave photons are perfectly absorbed and are down-converted into other frequency modes in the same waveguide. The proposed setup is applicable to single-photon detection in the microwave domain.
@article{arxiv.1306.6695,
title = {Implementation of an impedance-matched \Lambda system by dressed-state engineering},
author = {Kazuki Koshino and Kunihiro Inomata and Tsuyoshi Yamamoto and Yasunobu Nakamura},
journal= {arXiv preprint arXiv:1306.6695},
year = {2015}
}