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Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors
npj Quantum Information ( IF 6.6 ) Pub Date : 2021-08-19 , DOI: 10.1038/s41534-021-00464-5
Jared B. Hertzberg 1 , Eric J. Zhang 1 , Sami Rosenblatt 1 , Easwar Magesan 1 , John A. Smolin 1 , Jeng-Bang Yau 1 , Vivekananda P. Adiga 1 , Martin Sandberg 1 , Markus Brink 1 , Jerry M. Chow 1 , Jason S. Orcutt 1
Affiliation  

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.



中文翻译:

用于生产按比例放大的超导量子处理器的激光退火约瑟夫森结

随着超导量子电路扩展到更大尺寸,频率拥挤问题被证明是一项艰巨的任务。在这里,我们提出了固定频率量子位架构中这个问题的解决方案。通过在制造后系统地调整量子位频率,我们显示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 qubit 和交叉谐振门架构的“频率冲突”类型。使用统计建模,我们计算逃避所有这些条件的概率,作为量子位频率精度的函数。我们发现,如果没有制造后调整,找到可行晶格的概率很快接近 0。然而,通过证明的精度,可以找到具有良好产量的无碰撞晶格。

更新日期:2021-08-19
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