Electron-spin spectral diffusion in an erbium doped crystal at millikelvin temperatures

• URL: http://arxiv.org/abs/2203.15012v1
• Date: Mon, 28 Mar 2022 18:20:47 GMT
• Title: Electron-spin spectral diffusion in an erbium doped crystal at millikelvin temperatures
• Authors: Milos Ran\v{c}i\'c, Marianne Le Dantec, Sen Lin, Sylvain Bertaina, Thierry Chaneli\`ere, Diana Serrano, Philippe Goldner, Ren Bao Liu, Emmanuel Flurin, Daniel Est\`eve, Denis Vion and Patrice Bertet
• Abstract summary: We characterize the spectral diffusion processes that limit the electron-spin coherence of Er ions at millikelvin temperatures. The coherence time shows a strong temperature dependence, reaching 1.3 ms at 23 mK for an electron-spin transition of $167textEr$.
• Score: 0.8961088845748072
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Erbium-doped crystals offer a versatile platform for hybrid quantum devices because they combine magnetically-sensitive electron-spin transitions with telecom-wavelength optical transitions. At the high doping concentrations necessary for many quantum applications, however, strong magnetic interactions of the electron-spin bath lead to excess spectral diffusion and rapid decoherence. Here we lithographically fabricate a 4.4 GHz superconducting planar micro-resonator on a $\text{CaWO}_{4}$ crystal doped with Er ions at a concentration of twenty parts per million relative to Ca. Using the microwave resonator, we characterize the spectral diffusion processes that limit the electron-spin coherence of Er ions at millikelvin temperatures by applying 2- and 3-pulse echo sequences. The coherence time shows a strong temperature dependence, reaching 1.3 ms at 23 mK for an electron-spin transition of $^{167}\text{Er}$.

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