3. Materials
The realization of solid optical quantum systems requires a light-matter interface that can coherently absorb photons. Among the various possible systems, crystals doped with rare-earth ions appear to be good candidates. Indeed, these crystalline materials are robust, easy to use and feature a high density of optically active ions (typically 1018 ions/cm3) compared to atomic vapors (107 atoms/cm3).
3.1 Rare-earth-doped crystals
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Materials
Quantum memories
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