Twenty-three millisecond electron spin coherence of erbium ions in a natural-abundance crystal

• URL: http://arxiv.org/abs/2106.14974v1
• Date: Mon, 28 Jun 2021 20:45:11 GMT
• Title: Twenty-three millisecond electron spin coherence of erbium ions in a natural-abundance crystal
• Authors: Marianne Le Dantec, Milo\v{s} Ran\v{c}i\'c, Sen Lin, Eric Billaud, Vishal Ranjan, Daniel Flanigan, Sylvain Bertaina, Thierry Chaneli\`ere, Philippe Goldner, Andreas Erb, Ren Bao Liu, Daniel Est\`eve, Denis Vion, Emmanuel Flurin, Patrice Bertet
• Abstract summary: This is the longest electron spin coherence time measured in a material with a natural abundance of nuclear spins. Our results establish Er$3+$:CaWO$_4$ as a leading platform for quantum networks.
• Score: 0.8331845551768636
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Erbium ions doped into crystals have unique properties for quantum information processing, because of their optical transition at 1.5 $\mu$m and of the large magnetic moment of their effective spin-1/2 electronic ground state. Most applications of erbium require however long electron spin coherence times, and this has so far been missing. Here, by selecting a host matrix with a low nuclear-spin density (CaWO$_4$) and by quenching the spectral diffusion due to residual paramagnetic impurities at millikelvin temperatures, we obtain an Er$^{3+}$ electron spin coherence time of 23 ms. This is the longest electron spin coherence time measured in a material with a natural abundance of nuclear spins and on a magnetically-sensitive transition. Our results establish Er$^{3+}$:CaWO$_4$ as a leading platform for quantum networks.

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