超导量子比特在低温、低耗散下具有量子化的能级结构,是一种人工的固态量子系统.在三维谐振腔中,我们用dc-SQUID实现了跃迁频率可调的Transmon,可调量达到2.836 GHz.我们测量了可调Transmon随外加磁场变化的能谱,观察到了能级免交叉,这一现象来自Transmon与其他二能级系统的相互耦合.我们用理论模型进行了模拟仿真,计算结果和实验结果符合的很好.
Superconducting qubits with quantized energy level structure at low temperature and low dissipation situation is an artificial solid-state quantum system.In a three-dimensional cavity,we have successfully realized a tunable Transmon with dc SQUID,and the span of tunable transition frequency has reached 2.836 GHz.When we measure the flux bias dependent spectrum of the tunable Transmon,we have observed phenomenon of avoided level crossings,and this phenomenon comes from the coupling between Transmon and the other two level systems.The experimental results agree well with the simulated results using our theoretical model.
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