Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors
Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors
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DOI：
10.1038/s41534-021-00464-5
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发表时间：
2021-08-19
影响因子：
7.6
通讯作者：
Orcutt, Jason S.
中科院分区：
文献类型：
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作者：
Hertzberg, Jared B.;Zhang, Eric J.;Orcutt, Jason S.
随着超导量子电路规模的扩大，频率拥挤问题被证明是一项艰巨的任务。本文提出了一种在固定频率量子比特体系结构中解决这一问题的方法。通过系统地调整制造后的量子位频率，我们展示了设置量子位频率的精度提高了近十倍。为了评估可扩展性，我们确定了会损害transmon量子比特和交叉共振门架构的“频率碰撞”类型。利用统计建模，我们计算了规避所有这些条件的概率，作为量子比特频率精度的函数。我们发现，在没有后期调整的情况下，找到可行晶格的概率很快接近于0。然而，在演示的精度下，有可能找到具有良好良率的无碰撞晶格。这些技术和模型目前在可用的量子系统中使用，随着系统继续扩展到更大的尺寸，这些技术和模型将是不可或缺的。
As superconducting quantum circuits scale to larger sizes, the problem of frequency crowding proves a formidable task. Here we present a solution for this problem in fixed-frequency qubit architectures. By systematically adjusting qubit frequencies post-fabrication, we show a nearly tenfold improvement in the precision of setting qubit frequencies. To assess scalability, we identify the types of "frequency collisions" that will impair a transmon qubit and cross-resonance gate architecture. Using statistical modeling, we compute the probability of evading all such conditions, as a function of qubit frequency precision. We find that, without post-fabrication tuning, the probability of finding a workable lattice quickly approaches 0. However, with the demonstrated precisions it is possible to find collision-free lattices with favorable yield. These techniques and models are currently employed in available quantum systems and will be indispensable as systems continue to scale to larger sizes.