Rare earth doped crystals are a promising platform for long-distance quantum communications, where they can perform quantum light storage. Among different systems, ¹⁷¹Yb³⁺-doped Y₂SiO₅ (YSO) crystals stand out because of long optical and spin coherence times, and large hyperfine splitting, enabling long-time storage over large bandwidths. Here, the authors study the mechanisms affecting the optical decoherence in a broad range of temperatures (40 mK to 18 K) using high-resolution spectroscopic techniques, and identify ways to further improve the crystal's properties.
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Chiossi et al. (2024) studied this question.
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