Characterizing and Optimizing Qubit Coherence Based on SQUID Geometry
Characterizing and Optimizing Qubit Coherence Based on SQUID Geometry
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DOI：
10.1103/physrevapplied.13.054079
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发表时间：
2020-05-29
影响因子：
4.6
通讯作者：
Oliver, William D.
中科院分区：
文献类型：
--
作者：
Braumuller, Jochen;Ding, Leon;Oliver, William D.
在当代频率可调谐超导量子比特中，退相干的主要来源是1/f的磁通噪声。为了了解其起源并找到最小化其影响的方法，我们系统地研究了50多个通量量子比特中不同超导量子干涉器件（SQUID）几何参数的通量噪声幅值，并将我们的结果与位于SQUID环路周围界面的磁自旋缺陷的微观模型进行了比较。我们的数据与先前提出的模型的扩展是一致的，该模型基于对所调查鱿鱼中电流分布的数值模拟。我们的研究结果和详细的模型为最小化未来电路的磁通噪声敏感性提供了指导。
The dominant source of decoherence in contemporary frequency-tunable superconducting qubits is 1/f flux noise. To understand its origin and find ways to minimize its impact, we systematically study flux noise amplitudes in more than 50 flux qubits with varied superconducting quantum interference device (SQUID) geometry parameters and compare our results to a microscopic model of magnetic spin defects located at the interfaces surrounding the SQUID loops. Our data are in agreement with an extension of the previously proposed model, based on numerical simulations of the current distribution in the investigated SQUIDs. Our results and detailed model provide a guide for minimizing the flux noise susceptibility in future circuits.