Print Email Facebook Twitter Supercurrent parity meter in a nanowire Cooper pair transistor Title Supercurrent parity meter in a nanowire Cooper pair transistor Author WANG, J. (TU Delft Electrical Engineering, Mathematics and Computer Science; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Schrade, Constantin (Massachusetts Institute of Technology) Levajac, V. (TU Delft QRD/Kouwenhoven Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) van Driel, D. (TU Delft QRD/Kouwenhoven Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Li, K. (TU Delft BUS/Quantum Delft; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft) Badawy, G.H.A. (Eindhoven University of Technology) Lee, J.S. (University of California) Kouwenhoven, Leo P. (TU Delft QN/Kouwenhoven Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft; Microsoft Quantum Lab Delft) Shen, Jie (Chinese Academy of Sciences) Faculty Electrical Engineering, Mathematics and Computer Science Date 2022 Abstract We study a Cooper pair transistor realized by two Josephson weak links that enclose a superconducting island in an InSb-Al hybrid nanowire. When the nanowire is subject to a magnetic field, isolated subgap levels arise in the superconducting island and, because of the Coulomb blockade, mediate a supercurrent by coherent cotunneling of Cooper pairs. We show that the supercurrent resulting from such cotunneling events exhibits, for low to moderate magnetic fields, a phase offset that discriminates even and odd charge ground states on the superconducting island. Notably, this phase offset persists when a subgap state approaches zero energy and, based on theoretical considerations, permits parity measurements of subgap states by supercurrent interferometry. Such supercurrent parity measurements could, in a series of experiments, provide an alternative approach for manipulating and protecting quantum information stored in the isolated subgap levels of superconducting islands. To reference this document use: http://resolver.tudelft.nl/uuid:0751dde3-0954-4a70-9eb5-a94dfecf5844 DOI https://doi.org/10.1126/sciadv.abm9896 ISSN 2375-2548 Source Science Advances, 8 (16) Part of collection Institutional Repository Document type journal article Rights © 2022 J. WANG, Constantin Schrade, V. Levajac, D. van Driel, K. Li, G.H.A. Badawy, J.S. Lee, Leo P. Kouwenhoven, Jie Shen, More Authors Files PDF sciadv.abm9896.pdf 835.28 KB Close viewer /islandora/object/uuid:0751dde3-0954-4a70-9eb5-a94dfecf5844/datastream/OBJ/view