Rapid quantum states transfer and generation of non-local entangled states

在这个项目中，我们的目标是实现远距离量子点之间的相干单电子转移，飞行电荷量子比特的倍增和非局域电子自旋纠缠态的产生。我们首次成功地利用声表面波(SAW)在比消相干时间短得多的时间尺度上实现了距离较远的点之间的单电子转移。利用这一技术，我们实现了单电子单元的干涉实验，这是实现量子比特倍增的重要一步。我们还利用这种声表面波转移技术通过分裂两个纠缠电子来产生非局域纠缠态。此外，我们使用双路干涉仪进行了相位测量，发现通过近藤关联量子点的传输相位变为pi/2。

In this project, we aimed for realizing coherent single electron transfer between distant quantum dots, multiplication of the flying charge qubit and generation of a non-local electron spin entangled state. We first succeeded in realizing a single electron transfer between distant dots in a time scale much shorter than the decoherence time using a surface acoustic wave (SAW). Employing this technique, we then realized an interference experiment in a single electron unit, which is an important step towards qubit multiplication. We also employed this SAW transfer technique for generation of a non-local entangled state by splitting two entangled electrons. In addition, we employed a two-path interferometer for the phase measurement and found that transmission phase though a Kondo correlated quantum dot becomes pi/2.