An odd-occupied quantum dot in a Josephson junction can flip transmission phase, creating a $\pi$-junction. When the junction couples topological superconductors, no phase flip is expected. We investigate this and related effects in a full-shell hybrid interferometer, using gate voltage to control dot-junction parity and axial magnetic flux to control the transition from trivial to topological superconductivity. Enhanced zero-bias conductance and critical current for odd parity in the topological phase reflects hybridization of the confined spin with zero-energy modes in the leads.

中文翻译：

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平凡和拓扑约瑟夫森结中的量子点奇偶效应

约瑟夫森结中的一个奇数占据的量子点可以翻转传输相位，从而产生一个 $\pi$-结。当结耦合拓扑超导体时，不会发生相位翻转。我们在全壳式混合干涉仪中研究此效应和相关效应，使用栅极电压来控制点结奇偶校验，并使用轴向磁通量来控制从琐碎的过渡到拓扑的超导。拓扑阶段中奇偶校验的零偏压电导和临界电流的增强反映了受限自旋与引线中零能量模式的杂交。