2018/09/30 by Jean-Damien Pillet, J. -D. Pillet, Vincent Benzoni +6
Computer Science · Physics and Astronomy · #Andreev reflection #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Josephson effect #Physics #Quantum Information and Cryptography #Quantum optics and atomic interactions #Superconductivity #cond-mat.mes-hall #cond-mat.supr-con
paper · pdf · doi:10.1021/acs.nanolett.9b02686
published as Nano Letters 2019 19 (10), 7138-7143 · 19 pages, 4 figures, accepted version
openalex publication_date 2019/08/29 · arxiv created 2019/09/04 · arxiv updated 2019/10/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We propose the "Andreev molecule," an artificial quantum system composed of two closely spaced Josephson junctions. The coupling between Josephson junctions in an Andreev molecule occurs through the overlap and hybridization of the junction's "atomic" orbitals, Andreev Bound States. A striking consequence is that the supercurrent flowing through one junction depends on the superconducting phase difference across the other junction. Using the Bogolubiov-de-Gennes formalism, we derive the energy spectrum and nonlocal current-phase relation for arbitrary separation. We demonstrate the possibility of creating a φ-junction and propose experiments to verify our predictions. Andreev molecules may have potential applications in quantum information, metrology, sensing, and molecular simulation.