通过非局域约瑟夫森效应探测安德烈夫分子的费米子宇称
Fermion parity of an Andreev molecule probed by nonlocal Josephson effect
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中文总结 AI 辅助
研究利用非局域约瑟夫森效应，通过基于碳纳米管的安德烈夫分子，检测离域超导态的全局费米子宇称，观察到非局域约瑟夫森响应及相关态形成，证明分子基态宇称变化有特征相移，确定其为实验可及自由度。
中文摘要 AI 辅助
费米子宇称是超导多体状态的基本属性。本文表明，利用非局域约瑟夫森效应可在局部检测离域超导态的全局费米子宇称。通过由两个耦合量子点约瑟夫森结形成的基于碳纳米管的安德烈夫分子，观察到明显的非局域约瑟夫森响应，证明了跨越两个结的离域安德烈夫分子态的形成。还表明分子基态宇称的变化表现为非局域响应中的特征π相移。这些结果确定全局费米子宇称是混合超导电路中可通过非局域约瑟夫森效应轻易揭示的实验可及自由度。
英文摘要
Fermion parity is a fundamental property of superconducting many-body states. Here, we show that the global fermion parity of a delocalized superconducting state can be detected locally by exploiting the nonlocal Josephson effect. Using a carbon nanotube-based Andreev molecule formed by two coupled quantum-dot Josephson junctions, we observe a pronounced nonlocal Josephson response and demonstrate the formation of delocalized Andreev molecular states extending across both junctions. We further show that changes in the molecular ground-state parity manifest as characteristic $π$-phase shifts in the nonlocal response. Supported by a minimal theoretical model, these results identify global fermion parity as an experimentally accessible degree of freedom in hybrid superconducting circuits that can be readily revealed through the nonlocal Josephson effect.
