College of Liberal Arts and Sciences, Tokyo Medical and Dental University, Ichikawa, Chiba 272-0827, Japan.
Phys Rev Lett. 2013 Jun 28;110(26):263601. doi: 10.1103/PhysRevLett.110.263601. Epub 2013 Jun 27.
We have investigated the microwave response of a transmon qubit coupled directly to a transmission line. In a transmon qubit, owing to its weak anharmonicity, a single driving field may generate dressed states involving more than two bare states. We confirmed the formation of three-state dressed states by observing all of the six associated Rabi sidebands, which appear as either amplification or attenuation of the probe field. The experimental results are reproduced with good precision by a theoretical model incorporating the radiative coupling between the qubit and the microwave.
我们研究了直接耦合到传输线的超导量子比特的微波响应。在超导量子比特中，由于其较弱的非谐性，单个驱动场可能会产生涉及两个以上基态的 dressed 态。我们通过观察所有六个相关的 Rabi 边带，证实了三态 dressed 态的形成，这些边带表现为探针场的放大或衰减。实验结果通过一个包含量子比特和微波之间辐射耦合的理论模型得到了很好的重现。
