QuTech and Kavli Institute of Nanoscience, TU Delft, GA Delft 2600, The Netherlands.
Solid State Physics Laboratory, ETH Zürich, Zürich 8093, Switzerland.
Nat Nanotechnol. 2016 Apr;11(4):330-4. doi: 10.1038/nnano.2015.291. Epub 2016 Jan 4.
Spin-based electronics or spintronics relies on the ability to store, transport and manipulate electron spin polarization with great precision. In its ultimate limit, information is stored in the spin state of a single electron, at which point quantum information processing also becomes a possibility. Here, we demonstrate the manipulation, transport and readout of individual electron spins in a linear array of three semiconductor quantum dots. First, we demonstrate single-shot readout of three spins with fidelities of 97% on average, using an approach analogous to the operation of a charge-coupled device (CCD). Next, we perform site-selective control of the three spins, thereby writing the content of each pixel of this 'single-spin charge-coupled device'. Finally, we show that shuttling an electron back and forth in the array hundreds of times, covering a cumulative distance of 80 μm, has negligible influence on its spin projection. Extrapolating these results to the case of much larger arrays points at a diverse range of potential applications, from quantum information to imaging and sensing.
基于自旋的电子学或自旋电子学依赖于能够以极高的精度存储、传输和操纵电子自旋极化。在其极限情况下，信息存储在单个电子的自旋态中，此时量子信息处理也成为可能。在这里，我们展示了在三个半导体量子点的线性阵列中对单个电子自旋的操纵、传输和读出。首先，我们使用类似于电荷耦合器件 (CCD) 操作的方法，演示了平均保真度为 97%的三个自旋的单次读出。接下来，我们对三个自旋进行了选择性控制，从而写入了这个“单自旋电荷耦合器件”每个像素的内容。最后，我们表明，在该阵列中来回移动电子数百次，累计距离为 80μm，对其自旋投影几乎没有影响。将这些结果外推到更大的阵列情况表明，潜在的应用范围广泛，从量子信息到成像和传感。
