论文标题
单电子的时间分辨库仑碰撞
Time-resolved Coulomb collision of single electrons
论文作者
论文摘要
对弹道电子之间相互作用的精确控制将使我们能够以新颖的方式利用库仑相互作用，开发高速感应，以达到电子量子光学器件中的非线性状态，并实现针对飞行电子的基本两量子器操作的方案。电子之间的时间分辨碰撞已被用来探测单电子波袋的不可区分性，Wigner函数和破坏性。由于筛查的影响，这些实验均未在库仑相互作用特别强的制度中进行。在这里，我们探索了反向传播的弹道边缘状态下两个高能电子的库仑碰撞。我们表明，在这种未筛选的设备中，不同电子到达时间和屏障高度的分配概率是通过电子之间的库仑排斥力来塑造的。这防止了费米子交换统计表现所需的波袋重叠，但提出了一类新的用于研究和操纵弹道单电子相互作用的设备。
Precise control over interactions between ballistic electrons will enable us to exploit Coulomb interactions in novel ways, to develop high-speed sensing, to reach a non-linear regime in electron quantum optics and to realise schemes for fundamental two-qubit operations on flying electrons. Time-resolved collisions between electrons have been used to probe the indistinguishability, Wigner function and decoherence of single electron wavepackets. Due to the effects of screening, none of these experiments were performed in a regime where Coulomb interactions were particularly strong. Here we explore the Coulomb collision of two high energy electrons in counter-propagating ballistic edge states. We show that, in this kind of unscreened device, the partitioning probabilities at different electron arrival times and barrier height are shaped by Coulomb repulsion between the electrons. This prevents the wavepacket overlap required for the manifestation of fermionic exchange statistics but suggests a new class of devices for studying and manipulating interactions of ballistic single electrons.
