[22a-H101-1~9] Cavity & circuit-QED: frontier research at the leading edge

[22a-H101-4] Superconducting Artificial Atom - Harmonic Oscillator Ultrastrong-Coupling System

〇Tomoko Fuse¹, Fumiki Yoshihara¹, Sahel Ashhab², Kosuke Kakuyanagi³, Shiro Saito³, Kouichi Semba¹ (1.NICT, 2.Qatar Environment and Energy Research Institute, 3.NTT BRL)

Keywords:circuit-QED,superconductor,ultrastrong coupling

We have succeeded in realizing ultrastrong-coupling between an atom and a harmonic oscillator by using macroscopic persistent current states of a superconducting flux qubit (atom) and large zero-point current fluctuation of a lumped element LC resonator (harmonic oscillator). The energy spectrum of the ultrastrongly coupled system has been systematically studied. In this presentation, the recent experimental results will be shown.