Renormalized dynamics in charge qubit measurements by a single electron transistor

被引：5

作者：

Luo, JunYan ^{[1
]}

Jiao, HuJun ^{[2
]}

Wang, Jianzhong ^{[1
]}

Shen, Yu ^{[1
]}

He, Xiao-Ling ^{[1
]}

机构：

[1] Zhejiang Univ Sci & Technol, Sch Sci, Hangzhou 310023, Zhejiang, Peoples R China

[2] Shanxi Univ, Dept Phys, Taiyuan 030006, Shanxi, Peoples R China

来源：

PHYSICS LETTERS A | 2010年 / 374卷 / 48期

基金：

中国国家自然科学基金;

关键词：

Quantum measurement; Energy renormalization; Noise spectral; SHOT-NOISE; QUANTUM;

D O I：

10.1016/j.physleta.2010.10.002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate charge qubit measurements using a single electron transistor with focus on the backaction induced renormalization of qubit parameters It is revealed the renormalized dynamics leads to a number of intriguing features in the detector s noise spectra and therefore needs to be accounted for to properly understand the measurement result Noticeably the level renormalization gives rise to a strongly enhanced signal-to noise ratio which can even exceed the universal upper bound imposed quantum mechanically on linear-response detectors (C) 2010 Elsevier B V All rights reserved

引用

页码：4904 / 4908

页数：5

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