论文标题
通过纵向耦合到谐振器中的光子数量度，控制超导通量量子的过渡频率
Control of transition frequency of a superconducting flux qubit by longitudinal coupling to the photon number degree of freedom in a resonator
论文作者
论文摘要
我们控制一个由微波驱动器组成的直流电流超导量子干扰装置（DC-SQUID）的超导通量量子量子的过渡频率。 DC-squid介导了谐振器中的微波光子和磁通量乘积之间的耦合。频移的极性取决于量子的通量偏置的符号，并且可能是正的和负的。频移的绝对值通过增加谐振器中的光子数而变得更大。这些行为是通过磁通量量子与DC平方之间的磁相互作用的模型来复制的。磁通量量子的过渡频率的调整范围达到$ \ $ \ $ 1.9 GHz，它比使用典型的电路量子电动力学设备在色散状态下观察到的AC Stark/Lamb偏移大得多。
We control transition frequency of a superconducting flux qubit coupled to a frequency-tunable resonator comprising a direct current superconducting quantum interference device (dc-SQUID) by microwave driving. The dc-SQUID mediates the coupling between microwave photons in the resonator and a flux qubit. The polarity of the frequency shift depends on the sign of the flux bias for the qubit and can be both positive and negative. The absolute value of the frequency shift becomes larger by increasing the photon number in the resonator. These behaviors are reproduced by a model considering the magnetic interaction between the flux qubit and dc-SQUID. The tuning range of the transition frequency of the flux qubit reaches $\approx$ 1.9 GHz, which is much larger than the ac Stark/Lamb shift observed in the dispersive regime using typical circuit quantum electrodynamics devices.
