H. Fuketa, I. Akita, T. Ishikawa, H. Koike, T. Mori
{"title":"A Cryogenic CMOS Current Comparator for Spin Qubit Readout Achieving Fast Readout Time and High Current Resolution","authors":"H. Fuketa, I. Akita, T. Ishikawa, H. Koike, T. Mori","doi":"10.1109/vlsitechnologyandcir46769.2022.9830225","DOIUrl":null,"url":null,"abstract":"Employing a precise current readout circuit enabled by a current integrator and correlation double sampling circuit, we propose a cryo-CMOS current comparator circuit to readout spin qubit states by a charge sensing scheme. The reduced readout time by a factor of 1/100 and 100-times better current resolution with the readout fidelity of 99.9% compared to the conventional readout systems are achieved. Furthermore, the proposed current comparator attains the best figure-of-merit (FoM) among the conventional cryogenic current readout circuits. This is the demonstration that cryo-CMOS technology can enhance the performance of quantum computer systems.","PeriodicalId":332454,"journal":{"name":"2022 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits)","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2022-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2022 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/vlsitechnologyandcir46769.2022.9830225","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Employing a precise current readout circuit enabled by a current integrator and correlation double sampling circuit, we propose a cryo-CMOS current comparator circuit to readout spin qubit states by a charge sensing scheme. The reduced readout time by a factor of 1/100 and 100-times better current resolution with the readout fidelity of 99.9% compared to the conventional readout systems are achieved. Furthermore, the proposed current comparator attains the best figure-of-merit (FoM) among the conventional cryogenic current readout circuits. This is the demonstration that cryo-CMOS technology can enhance the performance of quantum computer systems.