Impact of Absorption due to Zero-Field Splitting on Loss in Dielectrics: A Case Study in Sapphire
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866910140703178752 |
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| author | Turiansky, Mark E. Van de Walle, Chris G. |
| author_facet | Turiansky, Mark E. Van de Walle, Chris G. |
| contents | 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-field-split 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_04610 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Impact of Absorption due to Zero-Field Splitting on Loss in Dielectrics: A Case Study in Sapphire Turiansky, Mark E. Van de Walle, Chris G. Quantum Physics Materials Science 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-field-split 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. |
| title | Impact of Absorption due to Zero-Field Splitting on Loss in Dielectrics: A Case Study in Sapphire |
| topic | Quantum Physics Materials Science |
| url | https://arxiv.org/abs/2504.04610 |