Work

Supercurrent tuning of the Josephson coupling energy

Year: 2026

Type: article

Abstract: The ability to non-dissipatively tune the Josephson coupling energy of Josephson junctions is a useful tool in frequency-tunable qubits. This is typically done by threading magnetic flux through two junctions connected in a loop, a geometry that exposes the qubit to magnetic environmental noise. In this paper, we show that by biasing a junction with supercurrent from a separate pair of superconducting leads coupled to the device, the Josephson energy can be tuned without the need for a flux loop. Our multiterminal device may enable the realization of a frequency-tunable qubit with greatly reduced susceptibility to flux noise.

Source: Physical review. B./Physical review. B

DOI: 10.1103/pc88-8kp6

Authors: Maxwell Wisne, Venkat Chandrasekhar

Institution: Northwestern University

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funder: National Science Foundation

Award: Probing topological effects in multiterminal Josephson junction devices