论文标题
破坏性的小公园效应在全壳纳米线中
Destructive Little-Parks Effect in a Full-Shell Nanowire-based Transmon
论文作者
论文摘要
在低$ E_J/E_C $制度中，研究了带有外延壳的半导体transmon。小公园振荡随沿杂化线轴的通量函数而变化，具有破坏性，从而形成了在半量子的插入通量上被金属状态隔开的重新进入超导的裂片。在第一个叶中，围绕壳的相位绕线会在核心中诱导拓扑超导性。在零和第一叶中都观察到相干的量子操作。通过连贯的单电子耦合在整个连接点上分裂奇偶校验乐队无法解决，无法解决线条扩展，在Majoraana耦合上绑定，$ e_m/h $ <10 MHz，比Josephson耦合$ E_J/H $ 〜4.77 ghz小得多。
A semiconductor transmon with an epitaxial Al shell fully surrounding an InAs nanowire core is investigated in the low $E_J/E_C$ regime. Little-Parks oscillations as a function of flux along the hybrid wire axis are destructive, creating lobes of reentrant superconductivity separated by a metallic state at a half-quantum of applied flux. In the first lobe, phase winding around the shell can induce topological superconductivity in the core. Coherent qubit operation is observed in both the zeroth and first lobes. Splitting of parity bands by coherent single-electron coupling across the junction is not resolved beyond line broadening, placing a bound on Majorana coupling, $E_M/h$ < 10 MHz, much smaller than the Josephson coupling $E_J/h$ ~ 4.7 GHz.
