Supercurrent parity-meter in a nanowire Cooper-pair transistor
- URL: http://arxiv.org/abs/2107.08466v1
- Date: Sun, 18 Jul 2021 14:54:04 GMT
- Title: Supercurrent parity-meter in a nanowire Cooper-pair transistor
- Authors: Ji-Yin Wang, Constantin Schrade, Vukan Levajac, David van Driel,
Kongyi Li, Sasa Gazibegovic, Ghada Badawy, Roy L.M. Op het Veld, Joon Sue
Lee, Mihir Pendharkar, Connor P. Dempsey, Chris J. Palmstr{\o}m, Erik P.A.M.
Bakkers, Liang Fu, Leo P. Kouwenhoven, and Jie Shen
- Abstract summary: 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.
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.
- Score: 3.404326288219972
- License: http://creativecommons.org/licenses/by/4.0/
- 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.
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