Quantum-Dot-Based Resonant Exchange Qubit
Quantum-Dot-Based Resonant Exchange Qubit
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DOI：
10.1103/physrevlett.111.050501
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发表时间：
2013-07-31
影响因子：
8.6
通讯作者：
Marcus, C. M.
中科院分区：
文献类型：
--
作者：
Medford, J.;Beil, J.;Marcus, C. M.
我们引入了一种固态量子比特，其中受限电子之间的交换相互作用提供了静态纵向场和振荡横向场，允许通过射频栅极电压脉冲进行快速和全面的量子比特控制。我们演示了双轴控制在失谐的最佳点，其中由于超精细耦合的泄漏被抑制的大交换间隙。一个π/2门时间为2.5纳秒和19 μ s的相干时间，使用多脉冲回波，也证明了。模型计算，包括超精细噪声的影响是在很好的定量与实验一致。
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.