Quantum-Dot-Based Resonant Exchange Qubit

被引：204
|
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.
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页数：4
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