| Presentation | 2023-08-08 Design of an rf-SQUID with π-Josephson junction for inverter function of directly coupled quantum-flux-parametron logic Wataru Komiya, Naoki Takeuchi, Yuki Yamanashi, Nobuyuki Yoshikawa, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Adiabatic quantum-flux-parametron (AQFP) logic relies on magnetic transformer for propagation and inversion, which presents a potential challenge for future scaling. Therefore, the investigation has been undertaken to realize a directly coupled quantum-flux-parametron (DQFP) logic that eliminates magnetic transformers for signal propagation. However, in previous studies, it was hard to mix buffers and inverters in the same logic gate from the perspective of driving ability and error rates, resulting in poor logic flexibility. In this study, we investigate an rf-SQUID with a Josephson junction shifted by π phase for inverter function (π-rf-SQUID). An inverter composed of the proposed rf-SQUID directly placed before a buffer has advantage of low power consumption from the conventional transformer-based approach while enabling easier scaling. In this presentation, we first describe the operating principles of AQFP. Then, we explain the design methodology of proposed rf-SQUID and the numerical simulation result about performance of an inverter using it. Finally, we describe the physical layout design of circuits using the AIST 10 kA cm-2 Nb high-speed standard process (HSTP). |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | superconducting integrated circuits / adiabatic superconducting logic / adiabatic quantum-flux-parametron (AQFP) / directly coupled quantum-flux-parametron logic (DQFP) |
| Paper # | SCE2023-8 |
| Date of Issue | 2023-08-01 (SCE) |
| Conference Information | |
| Committee | SCE |
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| Conference Date | 2023/8/8(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Yokohama National Univ. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Shigehito Miki(NICT) |
| Vice Chair | |
| Secretary | (Kanazawa Inst. of Tech.) |
| Assistant | Hiroyuki Akaike(Daido Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Superconductive Electronics |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Design of an rf-SQUID with π-Josephson junction for inverter function of directly coupled quantum-flux-parametron logic |
| Sub Title (in English) | |
| Keyword(1) | superconducting integrated circuits |
| Keyword(2) | adiabatic superconducting logic |
| Keyword(3) | adiabatic quantum-flux-parametron (AQFP) |
| Keyword(4) | directly coupled quantum-flux-parametron logic (DQFP) |
| 1st Author's Name | Wataru Komiya |
| 1st Author's Affiliation | Yokohama National University(Yokohama National Univ.) |
| 2nd Author's Name | Naoki Takeuchi |
| 2nd Author's Affiliation | Yokohama National University(Yokohama National Univ.) |
| 3rd Author's Name | Yuki Yamanashi |
| 3rd Author's Affiliation | Yokohama National University(Yokohama National Univ.) |
| 4th Author's Name | Nobuyuki Yoshikawa |
| 4th Author's Affiliation | Yokohama National University(Yokohama National Univ.) |
| Date | 2023-08-08 |
| Paper # | SCE2023-8 |
| Volume (vol) | vol.123 |
| Number (no) | SCE-153 |
| Page | pp.pp.39-44(SCE), |
| #Pages | 6 |
| Date of Issue | 2023-08-01 (SCE) |