Related papers: Impact of Absorption due to Zero-Field Splitting on Loss in Dielectrics

Impact of Absorption due to Zero-Field Splitting on Loss in Dielectrics

URL: http://arxiv.org/abs/2504.04610v1
Date: Sun, 06 Apr 2025 20:37:33 GMT
Title: Impact of Absorption due to Zero-Field Splitting on Loss in Dielectrics
Authors: Mark E. Turiansky, Chris G. Van de Walle,
Abstract summary: Coherence times of superconducting qubits are limited by loss mechanisms.<n>We propose a mechanism caused by transitions between zero-fieldsplit states of paramagnetic impurities or defects.<n>For Cr, Fe, and V impurities in sapphire, we find loss tangents at 4.5 GHz in the range of 10$-9$-10$-8$, comparable to the loss measured in experiments.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: The coherence times of superconducting qubits are limited by loss mechanisms, whose microscopic origins have remained elusive. We propose a mechanism caused by transitions between zero-fieldsplit states of paramagnetic impurities or defects. We derive the absorption cross section for a magnetic dipole transition and apply it to calculate the loss tangent. For Cr, Fe, and V impurities in sapphire, we find loss tangents at 4.5 GHz in the range of 10$^{-9}$-10$^{-8}$, comparable to the loss measured in experiments. This value suggests that magnetic loss may be a limiting factor in the coherence times of superconducting qubits.

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