Correlation-induced suppression of decoherence in capacitively coupled Cooper-pair boxes

被引：50

作者：

You, JQ ^{[1
]}

Hu, XD

Nori, F

机构：

[1] Inst Phys & Chem Res, Frontier Res Syst, Wako, Saitama 3510198, Japan

[2] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China

[3] Fudan Univ, Surface Phys Lab, Natl Key Lab, Shanghai 200433, Peoples R China

[4] SUNY Buffalo, Dept Phys, Buffalo, NY 14260 USA

[5] Univ Michigan, Ctr Study Complex Syst, Dept Phys, Ctr Theoret Phys, Ann Arbor, MI 48109 USA

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.72.144529

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Charge fluctuations from gate bias and background traps severely limit the performance of a charge qubit in a Cooper-pair box (CPB). Here we present an experimentally realizable method to control the decoherence effects of these charge fluctuations using two strongly capacitively coupled CPBs. This coupled-box system has a low-decoherence subspace of two states. Our results show that the interbox Coulomb correlation can help significantly suppress decoherence of this two-level system, making it a promising candidate as a logical qubit, encoded using two CPBs.

引用

页数：5

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