AI 中文总结
该研究提出电感保护的安德烈夫（IPA）自旋量子比特，通过线性电感器并联安德烈夫自旋量子比特延长其弛豫时间，兼具超导量子比特的长相干性与自旋自由度的操作优势。
AI 中文摘要
束缚在量子点约瑟夫森结中的准粒子自旋构成了安德烈夫自旋量子比特（ASQ）：一种半导体-超导体器件，其中局域自旋自由度与超导电性的相互作用会产生自旋分辨的约瑟夫森势。本研究表明，用线性电感器并联ASQ可通过将相空间中的自旋量子比特态分离到不同势阱中，几乎消除波函数重叠，从而延长其弛豫时间。由此得到的电感保护的安德烈夫（IPA）自旋量子比特在重耦合区等效于两个通量量子比特，每个自旋对应一个。因此，IPA量子比特兼具受保护超导量子比特的长相干时间、低频基态流形和大非谐性，以及自旋自由度的操作优势。
英文摘要
The spin of a quasiparticle trapped in a quantum dot Josephson junction forms the basis of an Andreev spin qubit (ASQ): a semiconductor-superconductor device where the interplay between a localized spin degree of freedom and superconductivity leads to a spin-resolved Josephson potential. In this work, we show that shunting an ASQ with a linear inductor enhances its relaxation time by separating the spin-qubit states into distinct potential wells in phase space, nearly eliminating wavefunction overlap. The resulting inductively protected Andreev (IPA) spin qubit is equivalent to two fluxoniums in the heavy regime, one for each spin. Thus, the IPA qubit combines the long coherence times, low-frequency ground-state manifold, and large anharmonicity of a protected superconducting qubit with the operational advantages of a spin degree of freedom.
Comments13 + 3 pages; 9 + 2 figures
