Quantum Dephasing in a Gated GaAs Triple Quantum Dot due to Nonergodic Noise

被引：48

作者：

Delbecq, M. R. ^{[1
]}

Nakajima, T. ^{[1
]}

Stano, P. ^{[1
,2
]}

Otsuka, T. ^{[1
]}

Amaha, S. ^{[1
]}

Yoneda, J. ^{[1
]}

Takeda, K. ^{[1
]}

Allison, G. ^{[1
]}

Ludwig, A. ^{[3
]}

Wieck, A. D. ^{[3
]}

Tarucha, S. ^{[1
,4
]}

机构：

[1] RIKEN, Ctr Emergent Matter Sci, 2-1 Hirosawa, Wako, Saitama 3510198, Japan

[2] Slovak Acad Sci, Inst Phys, Bratislava 84511, Slovakia

[3] Ruhr Univ Bochum, Lehrstuhl Angew Festkorperphys, D-44780 Bochum, Germany

[4] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 04期

基金：

日本科学技术振兴机构;

关键词：

ELECTRON-SPIN; ANOMALOUS DIFFUSION; COMPUTATION; QUBIT; FIELD;

D O I：

10.1103/PhysRevLett.116.046802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We extract the phase coherence of a qubit defined by singlet and triplet electronic states in a gated GaAs triple quantum dot, measuring on time scales much shorter than the decorrelation time of the environmental noise. In this nonergodic regime, we observe that the coherence is boosted and several dephasing times emerge, depending on how the phase stability is extracted. We elucidate their mutual relations, and demonstrate that they reflect the noise short-time dynamics.

引用

页数：6

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