Loss and decoherence in superconducting circuits on silicon: Insights from electron spin resonance
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866916325128929280 |
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| author | Jayaraman, Aditya Danilov, Andrey V. Bylander, Jonas Kubatkin, Sergey E. |
| author_facet | Jayaraman, Aditya Danilov, Andrey V. Bylander, Jonas Kubatkin, Sergey E. |
| contents | Solid-state devices used for quantum computation and quantum sensing applications are adversely affected by loss and noise caused by spurious, charged two-level systems (TLS) and stray paramagnetic spins. These two sources of noise are interconnected, exacerbating the impact on circuit performance. We use an on-chip electron spin resonance (ESR) technique, with niobium nitride (NbN) superconducting resonators, to study surface spins on silicon and the effect of post-fabrication surface treatments. We identify two distinct spin species that are characterized by different spin-relaxation times and respond selectively to various surface treatments (annealing and hydrofluoric acid). Only one of the two spin species has a significant impact on the TLS-limited resonator quality factor at low-power (near single-photon) excitation. We observe a 3-to-5-fold reduction in the total density of spins after surface treatments, and demonstrate the efficacy of ESR spectroscopy in developing strategies to mitigate loss and decoherence in quantum systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_03889 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Loss and decoherence in superconducting circuits on silicon: Insights from electron spin resonance Jayaraman, Aditya Danilov, Andrey V. Bylander, Jonas Kubatkin, Sergey E. Quantum Physics Superconductivity Solid-state devices used for quantum computation and quantum sensing applications are adversely affected by loss and noise caused by spurious, charged two-level systems (TLS) and stray paramagnetic spins. These two sources of noise are interconnected, exacerbating the impact on circuit performance. We use an on-chip electron spin resonance (ESR) technique, with niobium nitride (NbN) superconducting resonators, to study surface spins on silicon and the effect of post-fabrication surface treatments. We identify two distinct spin species that are characterized by different spin-relaxation times and respond selectively to various surface treatments (annealing and hydrofluoric acid). Only one of the two spin species has a significant impact on the TLS-limited resonator quality factor at low-power (near single-photon) excitation. We observe a 3-to-5-fold reduction in the total density of spins after surface treatments, and demonstrate the efficacy of ESR spectroscopy in developing strategies to mitigate loss and decoherence in quantum systems. |
| title | Loss and decoherence in superconducting circuits on silicon: Insights from electron spin resonance |
| topic | Quantum Physics Superconductivity |
| url | https://arxiv.org/abs/2402.03889 |