期刊
PHYSICAL REVIEW B
卷 92, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.035442
关键词
-
资金
- Army Research Office through the Intelligence Advance Research Program (IARPA) [W911NF-10-1-0324]
- German Research Foundation (DFG) [LI 2446/1-1, SCHO 287/7-1 /SH 82/2-1]
- German-Israeli Foundation (GIF) [1183-229.14/2011]
- Russian Science Foundation (RNF) [14-42-00044]
- RMIT Foundation through an International Research Exchange Fellowship
- Russian Science Foundation [14-42-00044] Funding Source: Russian Science Foundation
Since the very first experiments, superconducting circuits have suffered from strong coupling to environmental noise, destroying quantum coherence and degrading performance. In state-of-the-art experiments, it is found that the relaxation time of superconducting qubits fluctuates as a function of time. We present measurements of such fluctuations in a 3D-transmon circuit and develop a qualitative model based on interactions within a bath of background two-level systems (TLS) which emerge from defects in the device material. In our model, the time-dependent noise density acting on the qubit emerges from its near-resonant coupling to high-frequency TLS which experience energy fluctuations due to their interaction with thermally fluctuating TLS at low frequencies. We support the model by providing experimental evidence of such energy fluctuations observed in a single TLS in a phase qubit circuit.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据