AI 中文总结
本文探究量子点电荷传感器对量子点隧穿的近平衡反作用，利用安德森正交灾难实现测量，发现探测器能级可调控该反作用，确立其为量子动力学的可控影响因素。
AI 中文摘要
测量通过将量子系统与外部自由度耦合来扰动量子系统，但探测器反作用取决于测量本身的物理机制。在固态器件中，为实现更快测量而被驱动至远离平衡态的探测器会产生通常可理解为经典噪声的反作用。然而，强测量也可源于探测器中内禀的量子多体关联产生反作用，即便不存在散粒噪声亦是如此。本文中，我们通过量子点电荷传感器对第二个量子点与其库之间隧穿的影响来探究这种近平衡反作用。该测量实现了安德森正交灾难（Anderson Orthogonality Catastrophe, AOC）：探测器引线中的电子会对局部散射势的突变做出响应而重组，从而抑制共振隧穿，同时产生可与探测器交换能量的非弹性过程。改变探测器能级可将AOC反作用在隧穿动力学中从可忽略调至主导地位。更广泛而言，这些结果确立了探测器诱导的多体关联是量子动力学的可控影响因素。
英文摘要
Measurement perturbs a quantum system by coupling it to external degrees of freedom, but detector backaction depends on the physical mechanism of measurement itself. In solid-state devices, detectors driven far from equilibrium to enable faster measurements produce backaction that can often be understood as classical noise. However, a strong measurement can also induce backaction from quantum many-body correlations in the detector that are intrinsic to the measurement, even without shot noise. Here, we probe this near-equilibrium backaction through the effect of a quantum-dot charge sensor on tunnelling between a second quantum dot and its reservoirs. The measurement realizes the Anderson Orthogonality Catastrophe (AOC): electrons in the detector leads reorganize in response to an abrupt change in local scattering potential, suppressing resonant tunnelling while enabling inelastic processes that exchange energy with the detector. Changing the detector energy level tunes the AOC backaction from negligible to dominant in the tunnelling dynamics. More broadly, these results establish detector-induced many-body correlations as a controllable influence on quantum dynamics.
