AI 中文总结
本研究在悬浮碳纳米管中开发了一种电流模式电荷传感器，实现了优于现有技术的电荷灵敏度和单次读出性能，为量子电子学器件设计提供了新方案。
AI 中文摘要
超高灵敏度电荷检测是量子电子学中广泛应用的工具，可用于量子信息处理和凝聚态系统物理探测。现有方法要么需要阻抗匹配的谐振电路，要么需要放大器与样品之间毫米级的接近度，这两者都增加了复杂性并限制了器件设计。本研究在悬浮碳纳米管中引入一种电流模式电荷传感器，其在RLC谐振电路的1.25 MHz共振下工作，实现0.15 μe/√Hz的电荷灵敏度。利用该传感器测量同一纳米管中静电定义的双量子点（DQD），得到高度规则的电荷稳定性图。在3.56 μs的积分时间下，对DQD电荷态进行单次读出，10^7次测量中无错误分配，信噪比达17，超过现有技术水平。
英文摘要
Ultra-sensitive charge detection is a widely used tool for quantum electronics with applications in quantum information processing and in probing the physics of condensed matter systems. Existing approaches require either an impedance-matched resonant circuit, or millimeter-scale proximity between amplifier and sample, both adding complexity and constraining device design. In this work, we introduce a current-mode charge sensor in a suspended carbon nanotube, operating at the $1.25$ MHz resonance of an RLC tank circuit and achieving a charge sensitivity of $0.15~μe/\sqrt{\mathrm{Hz}}$. We utilize it to measure a double quantum dot (DQD) electrostatically defined in the same nanotube, revealing a highly regular charge stability diagram. We perform single-shot readout of the DQD charge state at an integration time of $3.56~μ\mathrm{s}$, without any false assignments over $10^{7}$ measurements and a signal-to-noise ratio of 17 exceeding the state of the art.
