Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
Phys Rev Lett. 2013 Feb 8;110(6):066806. doi: 10.1103/PhysRevLett.110.066806.
Because of the strong spin-orbit interaction in indium antimonide, orbital motion and spin are no longer separated. This enables fast manipulation of qubit states by means of microwave electric fields. We report Rabi oscillation frequencies exceeding 100 MHz for spin-orbit qubits in InSb nanowires. Individual qubits can be selectively addressed due to intrinsic differences in their g factors. Based on Ramsey fringe measurements, we extract a coherence time T(2)(*)=8±1 ns at a driving frequency of 18.65 GHz. Applying a Hahn echo sequence extends this coherence time to 34 ns.
由于铟锑化物中的强自旋轨道相互作用，轨道运动和自旋不再分离。这使得通过微波电场可以快速操纵量子比特状态。我们报告了在 InSb 纳米线中的自旋轨道量子比特的 Rabi 振荡频率超过 100 MHz。由于其 g 因子的固有差异，单个量子比特可以被选择性地寻址。基于 Ramsey 条纹测量，我们在 18.65 GHz 的驱动频率下提取出 8±1 ns 的相干时间 T(2)(*)。应用哈恩回波序列将此相干时间延长至 34 ns。
