New AC-Powered SFQ Digital Circuits
New AC-Powered SFQ Digital Circuits
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新型交流供电 SFQ 数字电路
DOI：
10.1109/tasc.2014.2382665
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发表时间：
2014
影响因子：
1.8
通讯作者：
S. K. Tolpygo
中科院分区：
文献类型：
--
作者：
V. Semenov;Y. Polyakov;S. K. Tolpygo
自20世纪70年代著名的IBM项目以来，超导数字电路的交流供电一直被放弃，但近年来量子互逆逻辑（RQL）的进展使人们对超导数字电路的交流供电重新产生了兴趣。在本文中，我们提出并证明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的交流/直流转换器，能够养活几个直流偏置门包围他们的交流偏置同行。作为第二步，我们介绍并提出了一个新的交流供电电路的第一次成功的演示-一个8192位的移位寄存器，超过32800约瑟夫森结（JJ）和JJ密度约6 · 105 JJ每平方厘米。我们建议这种类型的交流偏置电路，这需要高时钟频率的一些利基应用。例如，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磁场显微镜成像阵列。
Recent progress on 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 paper, 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 32800 Josephson junctions (JJs) and JJ density of about 6 · 105 JJ per cm2. We suggest a few niche applications for this type of ac-biased circuits, which require high clock rates. For example, these circuits, scalable to millions of JJs per chip, 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 megapixel imaging array for a magnetic field microscope.