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Supercurrent parity-meter in a nanowire Cooper-pair transistor
- Source :
- Science Advances 8, eabm9896 (2022)
- Publication Year :
- 2021
-
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, due to the Coulomb blockade,mediate a supercurrent by coherent co-tunneling of Cooper pairs. We show that the supercurrent resulting from such co-tunneling 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 new series of experiments, provide an alternative approach for manipulating and protecting quantum information stored in the isolated subgap levels of superconducting islands.
Details
- Database :
- arXiv
- Journal :
- Science Advances 8, eabm9896 (2022)
- Publication Type :
- Report
- Accession number :
- edsarx.2107.08466
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1126/sciadv.abm9896