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Superconducting Qubits Open Quantum Systems Decoherence

Phonon-bottlenecked spin relaxation of Er3+:CaWO4 at milliKelvin temperatures

arXiv
Authors: S. Rajendran, B. Mistri, P. K. Sharma, S. E. Kubatkin, A. V. Danilov, S. Dhomkar, S. E. de Graaf, V. Ranjan

Year

2026

Paper ID

63388

Status

Preprint

Abstract Read

~2 min

Abstract Words

78

Citations

0

Abstract

We study spin-lattice relaxation times of electron spins in Er3+:CaWO4 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 \(hbar ω0/kB T\)\]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.

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  • This paper contributes to the Superconducting Qubits research area in the Quantum Articles archive.
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  • We study spin-lattice relaxation times of electron spins in Er^3+:CaWO4 at millikelvin temperature, detected via their coupling to a low-mode volume superconducting resonator.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2605.18208 [2] arXiv https://arxiv.org/abs/2605.18208 [3] Publisher https://arxiv.org/abs/2605.18208

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External citation index: OpenAlex citation signal • updated 2026-06-20 09:32:59

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