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Paper Abstract and Keywords
Presentation 2025-11-07 16:05
(No Presentation) Analysis of the Operating Characteristics of Josephson Parametric Oscillators for Qubit Readout
Itaru Machimura, Shen hongxiang, Nobuyuki Yoshikawa (Yokohama National Univ.) SCE2025-8
Abstract (in Japanese) (See Japanese page) 
(in English) Combinatorial optimization problems that cannot be solved within a practical time using classical computers have recently become an important challenge. Quantum computers are expected to provide an effective approach to such problems. In particular, quantum annealing machines are well suited for optimization tasks. However, as the number of qubits increases, the control and readout circuits located at room temperature lead to complex wiring and thermal load issues. To address this, we propose placing the circuits in a cryogenic environment to reduce the number of microwave lines and associated thermal noise. Therefore, we focus on the Josephson Parametric Oscillator (JPO) as a qubit that can be read out under cryogenic conditions. In this study, we investigated the operating characteristics of the JPO, explored methods for its optimal design, and numerically evaluated the temperature dependence of its phase-discrimination sensitivity.
Keyword (in Japanese) (See Japanese page) 
(in English) Superconducting circuits / Quantum computing / Josephson Parametric Oscillator / SQUID / Quantum annealing / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 231, SCE2025-8, pp. 11-14, Nov. 2025.
Paper # SCE2025-8 
Date of Issue 2025-10-31 (SCE) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 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)
Download PDF SCE2025-8

Conference Information
Committee SCE  
Conference Date 2025-11-07 - 2025-11-07 
Place (in Japanese) (See Japanese page) 
Place (in English) RIEC, Tohoku Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Superconducting Electronics 
Paper Information
Registration To SCE 
Conference Code 2025-11-SCE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) (No Presentation) Analysis of the Operating Characteristics of Josephson Parametric Oscillators for Qubit Readout 
Sub Title (in English)  
Keyword(1) Superconducting circuits  
Keyword(2) Quantum computing  
Keyword(3) Josephson Parametric Oscillator  
Keyword(4) SQUID  
Keyword(5) Quantum annealing  
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Keyword(7)  
Keyword(8)  
1st Author's Name Itaru Machimura  
1st Author's Affiliation Yokohama National University (Yokohama National Univ.)
2nd Author's Name Shen hongxiang  
2nd Author's Affiliation Yokohama National University (Yokohama National Univ.)
3rd Author's Name Nobuyuki Yoshikawa  
3rd Author's Affiliation Yokohama National University (Yokohama National Univ.)
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Speaker Author-1 
Date Time 2025-11-07 16:05:00 
Presentation Time 25 minutes 
Registration for SCE 
Paper # SCE2025-8 
Volume (vol) vol.125 
Number (no) no.231 
Page pp.11-14 
#Pages 4 
Date of Issue 2025-10-31 (SCE) 

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