准粒子
电荷(物理)
噪音(视频)
量子隧道
物理
光谱(功能分析)
凝聚态物理
超导电性
原子物理学
量子力学
计算机科学
人工智能
图像(数学)
作者
Akiyoshi Tomonaga,Hiroto Mukai,Fumiki Yoshihara,Jaw-Shen Tsai
出处
期刊:Physical review
[American Physical Society]
日期:2021-12-27
卷期号:104 (22)
被引量:10
标识
DOI:10.1103/physrevb.104.224509
摘要
We report an experimentally observed anomalous doubly split spectrum and its split-width fluctuation in an ultrastrongly coupled superconducting qubit and resonator. From an analysis of Rabimodel and circuit model Hamiltonians, we found that the doubly split spectrum and split-width fluctuation are caused by discrete charge hops due to quasiparticle tunnelings and a continuous background charge fluctuation in islands of a flux qubit. During 70 hours in the spectrum measurement, split width fluctuates but the middle frequency of the split is constant. This result indicates that quasiparticles in our device seem mainly tunnel one particular junction. The background offsetcharge obtained from split width has the 1/f noise characteristic.
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