Phonon-bottlenecked spin relaxation of Er$^{3+}$:CaWO$_4$ at milliKelvin temperatures
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866914577742036992 |
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| author | Rajendran, S. Mistri, B. Sharma, P. K. Kubatkin, S. E. Danilov, A. V. Dhomkar, S. de Graaf, S. E. Ranjan, V. |
| author_facet | Rajendran, S. Mistri, B. Sharma, P. K. Kubatkin, S. E. Danilov, A. V. Dhomkar, S. de Graaf, S. E. Ranjan, V. |
| contents | We study spin-lattice relaxation times of electron spins in Er$^{3+}$:CaWO$_4$ at millikelvin temperature, detected via their coupling to a low-mode volume superconducting resonator. At large magnetic field supporting strong phonon-emission rates, we observe a noticeable increase in relaxation times with increasing spin-excitations, which exhibit a unique $[\tanh (\hbar ω_0/k_\text{B} T)]^2$ temperature dependence. These observations are typical of a phonon-bottlenecked spin relaxation, and have implications for quantum technologies that exploit rare-earth spin ensembles as coherent resources. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_18208 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Phonon-bottlenecked spin relaxation of Er$^{3+}$:CaWO$_4$ at milliKelvin temperatures Rajendran, S. Mistri, B. Sharma, P. K. Kubatkin, S. E. Danilov, A. V. Dhomkar, S. de Graaf, S. E. Ranjan, V. Quantum Physics We study spin-lattice relaxation times of electron spins in Er$^{3+}$:CaWO$_4$ at millikelvin temperature, detected via their coupling to a low-mode volume superconducting resonator. At large magnetic field supporting strong phonon-emission rates, we observe a noticeable increase in relaxation times with increasing spin-excitations, which exhibit a unique $[\tanh (\hbar ω_0/k_\text{B} T)]^2$ temperature dependence. These observations are typical of a phonon-bottlenecked spin relaxation, and have implications for quantum technologies that exploit rare-earth spin ensembles as coherent resources. |
| title | Phonon-bottlenecked spin relaxation of Er$^{3+}$:CaWO$_4$ at milliKelvin temperatures |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2605.18208 |