We study quantum critical phenomena in the microwave scattering of the subohmic spin-boson system, which exhibits a quantum phase transition at a critical system-reservoir coupling. By relating the reflection coefficient of a microwave with the dynamic susceptibility of the subohmic spin-boson system, we clarify the appearance of quantum critical phenomena in microwave scattering. Further, we propose experimental setups to realize the subohmic spin-boson system in a superconducting circuit composed of a charge qubit and a dissipative transmission line.
@article{arxiv.1904.03051,
title = {Microwave Scattering in the Subohmic Spin-Boson Systems of Superconducting Circuits},
author = {Tsuyoshi Yamamoto and Takeo Kato},
journal= {arXiv preprint arXiv:1904.03051},
year = {2019}
}