Observation and calculation of higher-order sideband transitions in a flux qubit coupled to a SQUID-based resonator
Observation and calculation of higher-order sideband transitions in a flux qubit coupled to a SQUID-based resonator
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与基于 SQUID 的谐振器耦合的通量量子位中高阶边带跃迁的观察和计算
DOI：
10.1088/1742-6596/568/5/052030
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
H. Yamanashi
中科院分区：
文献类型：
--
作者：
Y. Shimazu;R. Shirasaki;S. Toda;H. Yamanashi
量子比特-共振器耦合系统由于其在量子信息处理中的潜在用途而得到了广泛的研究。我们研究了一个超导磁通量子位耦合到一个共振器模式（SQUID等离子体模式）与直流SQUID用于读出量子位状态。高阶红色和蓝色边带跃迁，|M| = 1、2和3，其中M表示谐振器状态的量子数的变化，在远离对称点的地方清楚地观察到。我们计算了修饰态之间的跃迁矩阵元，并研究了它们对量子比特的耦合强度和通量偏置的依赖性。边带的观察，|M| = 3与计算结果一致。
Qubit-resonator coupled systems have been intensively studied because of their potential usefulness in quantum information processing. We investigated a superconducting flux qubit coupled to a resonator mode (SQUID plasma mode) associated with a dc SQUID used to read out the qubit state. Higher-order red and blue sideband transitions with| M|= 1, 2, and 3, where M represents the change in the quantum number of the resonator state, were clearly observed away from the symmetry point. We calculated the transition matrix elements between the dressed states and examined their dependence on both the coupling strength and the flux bias for the qubit. The observation of the sidebands up to| M|= 3 is consistent with the calculation results.