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Double detected spin-dependent quantum dot

机译：双重检测自旋相关的量子点

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摘要

We study the dynamics of a spin-dependent quantum dot system, where an unsharp and a sharp detection scenario is introduced. The back-action of the unsharp detection related to the magnetization, proposed in terms of the continuous quantum measurement theory, is observed via the von Neumann measurement (sharp detection) of the electric charge current. The behavior of the average electron charge current is studied as a function of the unsharp detection strength γ, and features of measurement back-action are discussed. The achieved equations reproduce the quantum Zeno effect. Considering magnetic leads, we demonstrate that the measurement process may freeze the system in its initial state. We show that the continuous observation may enhance the transition between spin states, in contradiction with rapidly repeated projective observations, when it slows down. Experimental issue, such as the accuracy of the electric current measurement, is analyzed.
机译：我们研究了自旋相关量子点系统的动力学，其中引入了不清晰和尖锐的检测场景。通过电荷电流的冯·诺依曼测量（锐化检测），可以观察到根据连续量子测量理论提出的与磁化有关的锐化检测的反向作用。研究了平均电子充电电流的行为与不清晰检测强度γ的关系，并讨论了测量反作用的特征。所获得的方程式再现了量子芝诺效应。考虑到磁导线，我们证明了测量过程可能会将系统冻结在其初始状态。我们表明，连续观察可能会加速自旋状态之间的过渡，这与快速重复的投射观察结果放慢时相反。分析了电流测量精度等实验问题。

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