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Paper Abstract and Keywords
Presentation 2023-08-08 13:50
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 (Yokohama National Univ.) SCE2023-8
Abstract (in Japanese) (See Japanese page) 
(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) 
(in English) superconducting integrated circuits / adiabatic superconducting logic / adiabatic quantum-flux-parametron (AQFP) / directly coupled quantum-flux-parametron logic (DQFP) / / / /  
Reference Info. IEICE Tech. Rep., vol. 123, no. 153, SCE2023-8, pp. 39-44, Aug. 2023.
Paper # SCE2023-8 
Date of Issue 2023-08-01 (SCE) 
ISSN Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee SCE  
Conference Date 2023-08-08 - 2023-08-08 
Place (in Japanese) (See Japanese page) 
Place (in English) Yokohama National Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SCE 
Conference Code 2023-08-SCE 
Language Japanese 
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.)
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Speaker Author-1 
Date Time 2023-08-08 13:50:00 
Presentation Time 25 minutes 
Registration for SCE 
Paper # SCE2023-8 
Volume (vol) vol.123 
Number (no) no.153 
Page pp.39-44 
Date of Issue 2023-08-01 (SCE) 

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