arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.06679cond-mat.mes-hallquant-ph
收藏

自旋量子比特的按需电控制

On-demand electrical control of spin qubits

Will Gilbert, Tuomo Tanttu, Wee Han Lim, MengKe Feng, Jonathan Y. Huang, Jesus D. Cifuentes, Santiago Serrano, Philip Y. Mai, Ross C. C. Leon, Christopher C. Es… 展开作者

Will Gilbert, Tuomo Tanttu, Wee Han Lim, MengKe Feng, Jonathan Y. Huang, Jesus D. Cifuentes, Santiago Serrano, Philip Y. Mai, Ross C. C. Leon, Christopher C. Escott, Kohei M. Itoh, Nikolay V. Abrosimov, Hans-Joachim Pohl, Michael L. W. Thewalt, Fay E. Hudson, Andrea Morello, Arne Laucht, Chih Hwan Yang, Andre Saraiva, Andrew S. Dzurak

摘要:

电子自旋曾经被泡利称为“经典的不可描述的二值性”,它是长寿命量子信息的自然资源,因为它几乎不受电波动的影响,并且可以用硅量子点复制成大型阵列,提供高保真度控制。巧合的是,最方便的控制策略之一是集成纳米级磁体,以人为地增强自旋和电场之间的耦合,这反过来又阻碍了自旋的抗噪性并增加了结构复杂性。在这里,我们展示了一种技术,使硅量子点中的电子的自旋和轨道运动之间的\emph{switchable}相互作用,而不存在的微磁体。通过控制纳米结构中电子的能量量子化,增强了轨道运动,硅中相对论性自旋轨道相互作用的自然微弱效应增强了三个数量级以上。快速电气控制在多个设备和电子配置中得到证明,突出了该技术的实用性。使用电驱动,我们实现了相干时间$T_{2,{\rm Hahn}}\approx50 μ$ s,快速单量子位门与${T_{π/2}=3}$ ns和门的随机基准探测率为99.93%。更高的门速度和与CMOS制造的更好兼容性,通过按需电气控制实现,改善了实现可扩展硅量子处理器的前景。

英文摘要:

Once called a "classically non-describable two-valuedness" by Pauli , the electron spin is a natural resource for long-lived quantum information since it is mostly impervious to electric fluctuations and can be replicated in large arrays using silicon quantum dots, which offer high-fidelity control. Paradoxically, one of the most convenient control strategies is the integration of nanoscale magnets to artificially enhance the coupling between spins and electric field, which in turn hampers the spin's noise immunity and adds architectural complexity. Here we demonstrate a technique that enables a \emph{switchable} interaction between spins and orbital motion of electrons in silicon quantum dots, without the presence of a micromagnet. The naturally weak effects of the relativistic spin-orbit interaction in silicon are enhanced by more than three orders of magnitude by controlling the energy quantisation of electrons in the nanostructure, enhancing the orbital motion. Fast electrical control is demonstrated in multiple devices and electronic configurations, highlighting the utility of the technique. Using the electrical drive we achieve coherence time $T_{2,{\rm Hahn}}\approx50 μ$s, fast single-qubit gates with ${T_{π/2}=3}$ ns and gate fidelities of 99.93 % probed by randomised benchmarking. The higher gate speeds and better compatibility with CMOS manufacturing enabled by on-demand electric control improve the prospects for realising scalable silicon quantum processors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑