Institute of Science and Technology Austria, Am Campus 1, 3400, Klosterneuburg, Austria.
National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China.
Nat Commun. 2018 Sep 25;9(1):3902. doi: 10.1038/s41467-018-06418-4.
Holes confined in quantum dots have gained considerable interest in the past few years due to their potential as spin qubits. Here we demonstrate two-axis control of a spin 3/2 qubit in natural Ge. The qubit is formed in a hut wire double quantum dot device. The Pauli spin blockade principle allowed us to demonstrate electric dipole spin resonance by applying a radio frequency electric field to one of the electrodes defining the double quantum dot. Coherent hole spin oscillations with Rabi frequencies reaching 140 MHz are demonstrated and dephasing times of 130 ns are measured. The reported results emphasize the potential of Ge as a platform for fast and electrically tunable hole spin qubit devices.
在过去的几年中，由于量子点中的空位有望成为自旋量子位，因此它们引起了相当大的关注。在这里，我们展示了在天然 Ge 中对自旋 3/2 量子位的两轴控制。该量子位形成在 hut 线双量子点器件中。通过向定义双量子点之一的电极施加射频电场，我们利用 Pauli 自旋阻塞原理证明了电偶极自旋共振。证明了达到 140 MHz 的相干空穴自旋振荡，并测量了 130 ns 的退相时间。所报道的结果强调了 Ge 作为用于快速和电可调空穴自旋量子位器件的平台的潜力。
Zotero 插件