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Twenty-three millisecond electron spin coherence of erbium ions in a natural-abundance crystal (2106.14974v1)

Published 28 Jun 2021 in quant-ph and cond-mat.mes-hall

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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