Quantum-Dot-Based Resonant Exchange Qubit

被引：207

作者：

Medford, J. ^{[1
]}

Beil, J. ^{[2
]}

Taylor, J. M. ^{[3
]}

Rashba, E. I. ^{[1
]}

Lu, H. ^{[4
]}

Gossard, A. C. ^{[4
]}

Marcus, C. M. ^{[2
]}

机构：

[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[2] Univ Copenhagen, Niels Bohr Inst, Ctr Quantum Devices, DK-2100 Copenhagen, Denmark

[3] NIST, Joint Quantum Inst, College Pk, MD 20742 USA

[4] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 05期

基金：

美国国家科学基金会; 新加坡国家研究基金会;

关键词：

COMPUTATION;

D O I：

10.1103/PhysRevLett.111.050501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We introduce a solid-state qubit in which exchange interactions among confined electrons provide both the static longitudinal field and the oscillatory transverse field, allowing rapid and full qubit control via rf gate-voltage pulses. We demonstrate two-axis control at a detuning sweet spot, where leakage due to hyperfine coupling is suppressed by the large exchange gap. A pi/2-gate time of 2.5 ns and a coherence time of 19 mu s, using multipulse echo, are also demonstrated. Model calculations that include effects of hyperfine noise are in excellent quantitative agreement with experiment.

引用

页数：4

共 26 条

[1] Fast sensing of double-dot charge arrangement and spin state with a radio-frequency sensor quantum dot [J].