互易量子逻辑（Reciprocal Quantum Logic，RQL）的最新进展使人们对超导数字电路的交流供电重新产生了兴趣。在这项工作中，我们提出并展示了新的交流偏置单通量量子（SFQ）电路，并寻找交流和目前占主导地位的直流偏置方案的协同作用。作为第一步，我们提出了一个片上AC/DC转换器，能够养活几个DC偏置门包围他们的AC偏置同行。作为第二步，我们介绍并展示了一个新的交流供电电路的首次成功演示-一个8192位移位寄存器，具有超过32，800个约瑟夫森结（JJ），JJ密度约为每个$cm^2$ 6 x $10^5$ JJ。我们建议这种类型的交流偏置电路的一些利基应用，不需要高时钟频率。例如，在一个示例中，这些可扩展到每个芯片数百万个JJ的电路可以用作新SFQ制造技术节点的方便基准，允许提取单个单元的操作裕度，从而“可视化”单个制造缺陷和通量捕获事件。该电路也可以发展成一个百万像素的成像阵列的磁场显微镜。
英文摘要：
Recent progress of Reciprocal Quantum Logic (RQL) has renewed interest in AC powering of superconductor digital circuits, which had been abandoned since the famous IBM project of 1970s. In this work we propose and demonstrate new AC-biased Single Flux Quantum (SFQ) circuits, and search for synergy of AC and currently dominating DC biasing schemes. As the first step, we suggest an on-chip AC/DC converter capable of feeding a few DC-biased gates surrounded by their AC-biased counterparts. As the second step, we introduce and present the first successful demonstration of a new AC-powered circuit - an 8192-bit shift register with over 32,800 Josephson junctions (JJs) and JJ density of about 6x$10^5$ JJ per $cm^2$. We suggest a few niche applications for this type of AC-biased circuits, not requiring high clock rates. E.g., these, scalable to millions of JJs per chip, circuits can serve as a convenient benchmark for new SFQ fabrication technology nodes, allowing the operating margins of individual cells to be extracted and, thus, 'visualize' individual fabrication defects and flux trapping events. The circuit can also be developed into a mega-pixel imaging array for a magnetic field microscope.
Digital-analog concept for superconducting perceptron-like neural networks
Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University（莫斯科国立大学索博列夫核物理研究所）；Moscow Technical University of Communications and Informatics (MTUCI)（莫斯科通信与信息技术大学）；Superconducting Quantum Computing Lab, Quantum Center, Skolkovo（斯科尔科沃量子中心超导量子计算实验室）；Kotelnikov Institute of Radioengineering and Electronics（科尔涅利尼科夫无线电工程与电子学研究所）
