与谐振子可调谐耦合的量子比特的驱动动力学和旋转回波
Driven dynamics and rotary echo of a qubit tunably coupled to a harmonic oscillator
摘要：
我们研究了与微波谐振器可调谐耦合的超导磁通量子比特的驱动动力学。我们发现量子位经历了由谐振器的非谐振驱动介导的振荡场，导致量子位拉比频率的强烈修改。这打开了一个额外的噪声通道，我们发现，在耦合参数的低频噪声导致驱动演化过程中的相干时间的减少。可以用旋转回波脉冲序列来减轻噪声，对于驱动系统，旋转回波脉冲序列类似于哈恩回波序列。
英文摘要：
We have investigated the driven dynamics of a superconducting flux qubit that is tunably coupled to a microwave resonator. We find that the qubit experiences an oscillating field mediated by off-resonant driving of the resonator, leading to strong modifications of the qubit Rabi frequency. This opens an additional noise channel, and we find that low-frequency noise in the coupling parameter causes a reduction of the coherence time during driven evolution. The noise can be mitigated with the rotary-echo pulse sequence, which, for driven systems, is analogous to the Hahn-echo sequence.
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