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Paper Abstract and Keywords
Presentation 2022-08-08 16:10
A cryogenic digital-to-analog converter for high-fidelity control of large-scale qubit arrays
Ryozo Takahashi, Takuji Miki, Makoto Nagata (Kobe Univ.) SDM2022-42 ICD2022-10
Abstract (in Japanese) (See Japanese page) 
(in English) This work presents a cryogenic digital-to-analog converter (DAC) for controlling a qubits in a large-scale quantum computer. The development of a qubit control chip which can be placed on a 4-8 K plate in a dilution refrigerator is one of the most important challenges for realizing large-scale quantum computers. This work proposes a small and low-power DAC for a bias voltage generator, one of the major components of a control chip. The capacitor arrays composing a charge-redistribution DAC are miniaturized by utilizing the cryogenic characteristics of low noise and leakage. Furthermore, capacitor mismatches due to their small size are automatically corrected by a newly proposed calibration technique with a small area-overhead. The prototype DAC was evaluated at 8 K temperature, and it achieved a very small area of 0.008 mm^2 and low power consumption of 5.8 uW, while a non-linearity error within +/-2 LSB.
Keyword (in Japanese) (See Japanese page) 
(in English) cryogenic / digital-to-analog converter / mismatch calibration / quantum computer / / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 149, ICD2022-10, pp. 37-40, Aug. 2022.
Paper # ICD2022-10 
Date of Issue 2022-08-01 (SDM, ICD) 
ISSN Online edition: ISSN 2432-6380
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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 ICD SDM ITE-IST  
Conference Date 2022-08-08 - 2022-08-10 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English) Analog, Mixed Analog and Digital, RF, and Sensor Interface, Low Voltage/Low Power Techniques, Novel Devices/Circuits, and the Applications 
Paper Information
Registration To ICD 
Conference Code 2022-08-ICD-SDM-IST 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A cryogenic digital-to-analog converter for high-fidelity control of large-scale qubit arrays 
Sub Title (in English)  
Keyword(1) cryogenic  
Keyword(2) digital-to-analog converter  
Keyword(3) mismatch calibration  
Keyword(4) quantum computer  
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1st Author's Name Ryozo Takahashi  
1st Author's Affiliation Kobe University (Kobe Univ.)
2nd Author's Name Takuji Miki  
2nd Author's Affiliation Kobe University (Kobe Univ.)
3rd Author's Name Makoto Nagata  
3rd Author's Affiliation Kobe University (Kobe Univ.)
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Speaker Author-1 
Date Time 2022-08-08 16:10:00 
Presentation Time 25 minutes 
Registration for ICD 
Paper # SDM2022-42, ICD2022-10 
Volume (vol) vol.122 
Number (no) no.148(SDM), no.149(ICD) 
Page pp.37-40 
#Pages
Date of Issue 2022-08-01 (SDM, ICD) 


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