论文标题
带相位的Josephson弱环节的电路
Circuit-QED with phase-biased Josephson weak links
论文作者
论文摘要
通过将超导弱连接耦合到微波谐振器，最近的实验探测了频谱并实现了各种系统中Andreev状态的量子操作。但是，缺少对谐振器对安德里夫级别占用的变化的响应的定量理解，这些响应具有典型性质。在这里，使用Bogoliubov-De Gennes形式主义描述弱环和耦合与谐振器的一般表述，我们计算了谐振频率的变化，这是占用率的函数，并描述了如何通过相或电场微波驱动器诱导的过渡。我们应用这种形式主义来分析使用电路QED技术在超导原子接触和半导体纳米线约瑟夫森连接方面获得的最新实验结果。
By coupling a superconducting weak link to a microwave resonator, recent experiments probed the spectrum and achieved the quantum manipulation of Andreev states in various systems. However, the quantitative understanding of the response of the resonator to changes in the occupancy of the Andreev levels, which are of fermionic nature, is missing. Here, using Bogoliubov-de Gennes formalism to describe the weak link and a general formulation of the coupling to the resonator, we calculate the shift of the resonator frequency as a function of the levels occupancy and describe how transitions are induced by phase or electric field microwave drives. We apply this formalism to analyze recent experimental results obtained using circuit-QED techniques on superconducting atomic contacts and semiconducting nanowire Josephson junctions.
