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ID 33110
本文ファイル
別タイトル
Theoretical studies on decoherence of superconducting phase qubit <Summaries of the Doctoral Theses>
著者
小杉 範仁
NDC
電気工学
抄録(英)
Decoherence of a quantum bit (qubit) as a building block for quantum computer is one of the most important problem for the practical realization of quantum computing. In the previous research for the quantum computing, it is known that decoherence is caused by the relaxation processes in the qubits.

In this thesis, we study the measurement and control methods of relaxation times for superconducting phase qubit that contributes to the scalable quantum computer. Firstly, we propose a measurement method by using dynamically-controlled qubits. Secondly, we estimate the relaxation times by using the formula of the relaxation times obtained by the Bloch-Redfield theory. Thirdly, we try to control the relaxation processes in order to confirm the validity of the estimation. As a result, we can eliminate the pure dephasing process in the superconducting phase qubit. Herewith, the validity of the estimation of relaxation time is partly confirmed. We find the possibility of the variable coupling between the qubit and its environment.

The study outlined above provides a new approach to the solution of the decoherence problem underlying the practical realization of quantum computing.
掲載誌名
広島大学大学院総合科学研究科紀要. II, 環境科学研究
5巻
開始ページ
109
終了ページ
112
出版年月日
2010-12-31
出版者
広島大学大学院総合科学研究科
ISSN
1881-7696
NCID
言語
日本語
NII資源タイプ
紀要論文
広大資料タイプ
学内刊行物(紀要等)
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
Copyright (c) 2010 Graduate School of Integrated Arts and Sciences, Hiroshima University. All rights reserved.
部局名
総合科学研究科
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