发表机构
Quantum Motion; Cavendish Laboratory, University of Cambridge; London Centre for Nanotechnology, UCL; Research Laboratory of Electronics, Massachusetts Institute of Technology; Institute of Experimental and Applied Physics and Halle-Berlin-Regensburg Cluster of Excellence CCE, University of Regensburg; Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen; QuTech and Kavli Institute of Nanoscience, Delft University of Technology（量子运动; 剑桥大学卡文迪许实验室; 伦敦纳米技术中心，伦敦大学学院; 麻省理工学院电子研究实验室; 雷根斯堡大学实验与应用物理研究所及哈雷-柏林-雷根斯堡卓越集群CCE; 哥本哈根大学尼尔斯·玻尔研究所量子器件中心; 代尔夫特理工大学QuTech和卡弗里纳米科学研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究提出射频电子级联读出方法，利用量子点共隧穿实现电荷极化增强，通过理论与实验验证，提升半导体量子计算中色散读出的保真度。
AI 中文摘要
半导体量子点中的电子共隧穿是一种高阶隧穿机制，它通过能量上不可达的虚中间构型连接初始和最终电荷态。在量子点阵列中，此类过程可产生跨越多个隧穿结的同时电荷运动，并实现原本会被库仑阻塞抑制的跃迁。在此，我们基于先前的原理验证演示，研究了射频（rf）驱动的关联共隧穿及其在色散量子点读出中的应用。通过理论建模以及在两种不同代工厂制造的硅器件中的实验测量，我们表明外部射频驱动可诱导关联的循环单电子跃迁，从而增强系统的电荷极化。我们为射频电子级联读出开发了一个通用理论框架，该框架利用具有三个或更多量子点的量子点系统中的共隧穿事件来产生相对信号增强，并将其实验演示扩展到栅极感应器件架构。我们的结果确立了射频电子级联读出的工作原理，并为提高半导体量子计算架构中的色散读出保真度提供了一条途径。
英文摘要
Electron cotunneling in semiconductor quantum dots is a higher-order tunneling mechanism that connects initial and final charge states through energetically inaccessible virtual intermediate configurations. In quantum-dot arrays, such processes can produce simultaneous charge motion across multiple tunnel junctions and enable transitions that would otherwise be suppressed by Coulomb blockade. Here, building on an earlier proof-of-principle demonstration, we investigate radio-frequency (rf)-driven correlated cotunneling and its application to dispersive quantum-dot readout. Using both theoretical modeling and experimental measurements in two different foundry-fabricated silicon devices, we show that an external rf drive can induce correlated cyclic single-electron transitions, resulting in enhanced charge-polarization of the system. We develop a general theoretical framework for rf electron-cascade readout, which exploits cotunneling events in quantum-dot systems with three or more dots to produce a relative signal enhancement, and extend its experimental demonstration to a gate-sensed device architecture. Our results establish the operating principles of rf electron-cascade readout and provide a route to increased dispersive readout fidelity in semiconductor quantum computing architectures.
