论文标题
电子级联旋转读数
Electron cascade for spin readout
论文作者
论文摘要
限制在半导体量子点阵列中的电子具有电荷和自旋度自由度。旋转提供了可控制且长期寿命的Qubit实现。点阵列中的电荷配置受库仑排斥的影响，相同的交互使电荷传感器能够探测此配置。在这里，我们表明库仑排斥允许初始电荷过渡诱导随后的电荷转变，从而诱导一系列电子啤酒花，例如倒数式多米诺骨牌。级联可以沿量子点阵列在远处传输信息，该距离延伸了直接库仑排斥的效果。我们证明，可以将一系列电子与Pauli Spin Blockade结合使用，以使用远程充电传感器读取旋转。我们在1.7 $ \mathrmμ$ s中获得> 99.9％的自旋读数保真度。基于级联的读数可以操作密集的二维量子点阵列，并放置在外围的电荷传感器。此类阵列的高连通性大大提高了量子点系统的量子计算和仿真功能。
Electrons confined in semiconductor quantum dot arrays have both charge and spin degrees of freedom. The spin provides a well-controllable and long-lived qubit implementation. The charge configuration in the dot array is influenced by Coulomb repulsion, and the same interaction enables charge sensors to probe this configuration. Here we show that the Coulomb repulsion allows an initial charge transition to induce subsequent charge transitions, inducing a cascade of electron hops, like toppling dominoes. A cascade can transmit information along a quantum dot array over a distance that extends by far the effect of the direct Coulomb repulsion. We demonstrate that a cascade of electrons can be combined with Pauli spin blockade to read out spins using a remote charge sensor. We achieve > 99.9% spin readout fidelity in 1.7 $\mathrmμ$s. The cascade-based readout enables operation of a densely-packed two-dimensional quantum dot array with charge sensors placed at the periphery. The high connectivity of such arrays greatly improves the capabilities of quantum dot systems for quantum computation and simulation.
