このエントリーをはてなブックマークに追加
ID 33110
file
title alternative
Theoretical studies on decoherence of superconducting phase qubit <Summaries of the Doctoral Theses>
creator
Kosugi, Norihito
NDC
Electrical engineering
abstract
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.
journal title
Bulletin of the Graduate School of Integrated Arts and Sciences, Hiroshima University. II, Studies in environmental sciences
volume
Volume 5
start page
109
end page
112
date of issued
2010-12-31
publisher
広島大学大学院総合科学研究科
issn
1881-7696
ncid
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2010 Graduate School of Integrated Arts and Sciences, Hiroshima University. All rights reserved.
department
Graduate School of Integrated Arts and Sciences
他の一覧