Observation of Higher-Order Sideband Transitions and First-Order Sideband Rabi Oscillations in a Superconducting Flux Qubit Coupled to a SQUID Plasma Mode
Observation of Higher-Order Sideband Transitions and First-Order Sideband Rabi Oscillations in a Superconducting Flux Qubit Coupled to a SQUID Plasma Mode
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DOI：
10.7566/jpsj.82.074710
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发表时间：
2013-05
影响因子：
1.7
通讯作者：
Y. Shimazu;Masaki Takahashi;N. Okamura
中科院分区：
文献类型：
--
作者：
Y. Shimazu;Masaki Takahashi;N. Okamura
我们报告了超导通量量子位的光谱测量和时域测量结果。用于读出量子位的直流超导量子干涉装置（SQUID）和并联电容器形成了产生 SQUID 等离子体模式的 LC 谐振器。在简单的测量方案中观察到高阶红边带和蓝边带，因为谐振器的谐振能量 600 MHz 与热能相当。我们还观察到载流子跃迁和一阶边带跃迁的拉比振荡。由于量子位耦合到直流 SQUID 的单臂，因此量子位-SQUID 耦合在零偏置电流下非常显着，在零偏置电流下观察到了这些现象。将载波跃迁和边带跃迁的拉比周期之间的比率与根据耦合常数估计的比率进行比较，耦合常数是单独确定的。该结果可以通过假设谐振器的初始激励来解释。
We report results of spectroscopic measurements and time-domain measurements of a superconducting flux qubit. The dc superconducting quantum interference device (SQUID), used for readout of the qubit, and a shunt capacitor formed an LC resonator generating a SQUID plasma mode. Higher-order red and blue sidebands were observed in a simple measurement scheme because the resonant energy of the resonator, 600 MHz, was comparable to the thermal energy. We also observed Rabi oscillations on the carrier transition and the first-order sideband transitions. Because the qubit was coupled to a single arm of the dc SQUID, the qubit-SQUID coupling was significant at zero bias current, where these phenomena were observed. The ratios between the Rabi periods for the carrier transition and the sideband transitions are compared with those estimated from the coupling constant, which was separately determined. The result may be explained by assuming initial excitation of the resonator.