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Superconducting Qubits

WSi weak link element with a non-sinusoidal current-phase relation

arXiv

Authors: Sarah Garcia Jones, Trevyn F. Q. Larson, Sai Pavan Chitta, Heli Vora, Varun Verma, Sae Woo Nam, José Aumentado, Jens Koch, Raymond W. Simmonds, András Gyenis

Year

2026

Paper ID

63484

Status

Preprint

Abstract Read

~2 min

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Abstract

Nonlinearity is an essential ingredient for encoding quantum states with non-uniform energy spacing, implementing coherent quantum gates, reading out qubits, amplifying, and mixing electromagnetic signals. In this work, we demonstrate the nonlinear behavior of a constriction fabricated from an amorphous, high-kinetic inductance material, tungsten silicide, embedded in a three-dimensional RF-SQUID. We find that the results are consistent with the weak link behaving as a Josephson junction with a sawtooth-like current-phase relation or a quantum phase slip element. Finally, we measure relaxation times of the metastable, persistent-current states trapped in the local minima of the potential.

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Nonlinearity is an essential ingredient for encoding quantum states with non-uniform energy spacing, implementing coherent quantum gates, reading out qubits, amplifying, and...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2605.20652 [2] arXiv https://arxiv.org/abs/2605.20652 [3] Publisher https://arxiv.org/abs/2605.20652

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