The realization of integrated quantum circuits requires precise on-chip control of charge carriers. Aiming at the coherent coupling of distant nanostructures at zero magnetic field, here we study the ballistic electron transport through two quantum point contacts (QPCs) in series in a three terminal configuration. We enhance the coupling between the QPCs by electrostatic focusing using a field effect lens. To study the emission and collection properties of QPCs in detail we combine the electrostatic focusing with magnetic deflection. Comparing our measurements with quantum mechanical and classical calculations we demonstrate how the coherent and ballistic dynamics depend on the details of the QPC confinement potentials.

中文翻译：

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具有弹道耦合量子点触点的相干电子光学器件

集成量子电路的实现需要对载流子进行精确的片上控制。针对零磁场下远距离纳米结构的相干耦合，在这里我们研究了在三个端子配置中通过串联的两个量子点触点（QPC）的弹道电子传输。我们使用场效应透镜通过静电聚焦来增强QPC之间的耦合。为了详细研究QPC的发射和收集特性，我们将静电聚焦与磁偏转相结合。将我们的测量结果与量子力学和经典计算进行比较，我们证明了相干和弹道动力学如何取决于QPC约束电位的细节。