论文标题
在超构耦合电路量子电动力学系统中的光子饰面的Bloch-siegert移位
Photon-Dressed Bloch-Siegert Shift in an Ultrastrongly Coupled Circuit Quantum Electrodynamical System
论文作者
论文摘要
预计强耦合方案以外的空腔量子电动力学（QED）系统将表现出有趣的量子现象。在这里，我们报告了通过在超耦合的电路-QED系统中利用相同类型的状态过渡来对光子穿压的量子跃迁频率进行直接测量，该频率通过将超导量量的磁通量耦合到Coplanar-WaveGuide-WaveGuide复合器中实现。这表明对超局部耦合量子系统的光子穿衣布洛克 - siegert移位有令人信服的观察。此外，我们的结果表明，随着光子数量的增加，光子切割的bloch-siegert偏移变得更加明显，这是量子兔模型的特征。
A cavity quantum electrodynamical (QED) system beyond the strong-coupling regime is expected to exhibit intriguing quantum phenomena. Here we report a direct measurement of the photon-dressed qubit transition frequencies up to four photons by harnessing the same type of state transitions in an ultrastrongly coupled circuit-QED system realized by inductively coupling a superconducting flux qubit to a coplanar-waveguide resonator. This demonstrates a convincing observation of the photon-dressed Bloch-Siegert shift in the ultrastrongly coupled quantum system. Moreover, our results show that the photon-dressed Bloch-Siegert shift becomes more pronounced as the photon number increases, which is a characteristic of the quantum Rabi model.
