{"title":"Low-Power Single-Flux-Quantum Standard Cell Library Using 250 A/cm$^{2}$ Process for Qubit Control Applications","authors":"Masamitsu Tanaka;Yoshihiro Kitagawa;Tetsuro Satoh;Tsuyoshi Yamamoto","doi":"10.1109/TASC.2024.3521892","DOIUrl":null,"url":null,"abstract":"In this paper, we report the development of a low-power single-flux-quantum (SFQ) standard cell library and experimental results, including the cell design, high-speed test of shift-registers, delay measurement using ring oscillators, and demonstration of simple demultiplexers. We fabricated the SFQ circuits using a lowered critical current density (250 A/cm\n<inline-formula><tex-math>$^{2}$</tex-math></inline-formula>\n) process and low-voltage design (0.5 or 0.1 mV). We reduced the power consumption to 1/50 or 1/250 from the conventional SFQ circuits operating at 4.2 K. We designed several essential SFQ cells, including wiring elements, flip-flops, and logic gates with the fabrication process using four planarized Nb layers and obtained the correct operation at 0.3 K. We tested 8-bit shift-registers aiming to evaluate the operating frequency of the developed SFQ cells. The 0.1-mV shift-registers operated up to 8.5 GHz. The experimental results of ring oscillators showed good agreement with the analog circuit simulation results. We believe that our experimentally-verified standard cell library is ready to use for SFQ-based digital control of qubits, such as demultiplexing of control signals, and the timing information and power consumption will be valuable information as the baseline to discuss future scalable quantum computer systems.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7000,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Applied Superconductivity","FirstCategoryId":"101","ListUrlMain":"https://ieeexplore.ieee.org/document/10814065/","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
In this paper, we report the development of a low-power single-flux-quantum (SFQ) standard cell library and experimental results, including the cell design, high-speed test of shift-registers, delay measurement using ring oscillators, and demonstration of simple demultiplexers. We fabricated the SFQ circuits using a lowered critical current density (250 A/cm
$^{2}$
) process and low-voltage design (0.5 or 0.1 mV). We reduced the power consumption to 1/50 or 1/250 from the conventional SFQ circuits operating at 4.2 K. We designed several essential SFQ cells, including wiring elements, flip-flops, and logic gates with the fabrication process using four planarized Nb layers and obtained the correct operation at 0.3 K. We tested 8-bit shift-registers aiming to evaluate the operating frequency of the developed SFQ cells. The 0.1-mV shift-registers operated up to 8.5 GHz. The experimental results of ring oscillators showed good agreement with the analog circuit simulation results. We believe that our experimentally-verified standard cell library is ready to use for SFQ-based digital control of qubits, such as demultiplexing of control signals, and the timing information and power consumption will be valuable information as the baseline to discuss future scalable quantum computer systems.
期刊介绍:
IEEE Transactions on Applied Superconductivity (TAS) contains articles on the applications of superconductivity and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Large scale applications include magnets for power applications such as motors and generators, for magnetic resonance, for accelerators, and cable applications such as power transmission.