Universal bound on microwave dissipation in superconducting circuits.

Authors

Thibault Charpentier, Anton Khvalyuk, Lev Ioffe, Mikhail Feigel'man, Nicolas Roch, Benjamin Sacépé

Published in

Science advances. Volume 12. Issue 35. Pages eaed3922. Aug 28, 2026. Epub Aug 26, 2026.

Abstract

Improving the coherence of superconducting qubits is essential for advancing quantum technologies. While superconductors are theoretically perfect conductors, they consistently exhibit residual energy dissipation when driven by microwave currents, limiting coherence times. Here, we report an empirical scaling relation between microwave dissipation and the superfluid density, a bulk property of superconductors related to charge carrier density and disorder. Our analysis spans a wide range of superconducting materials and device geometries, from highly disordered amorphous films to ultraclean systems with record-high quality factors, including resonators, three-dimensional cavities, and transmon qubits. This scaling reveals an intrinsic bulk dissipation channel, independent of surface dielectric losses, which we attribute to nonequilibrium quasiparticles trapped within disorder-induced spatial variations of the superconducting gap, with a density set by a universal material parameter. Our findings identify an empirical coherence limit associated with intrinsic material properties and provide a data-driven basis for materials selection in future superconducting quantum circuits.

PMID:
42647650
Bibliographic data and abstract were imported from PubMed on 27 Aug 2026.

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