Transportable and long-lived qautnum memory based on Eu:YSO crystals.

References:

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A faithful solid-state spin-wave quantum memory for polarization qubits. Science Bulletin 67, 676 (2022)

Elimination of noise in optically rephased photon echoes. Nature Communications 12, 4378 (2021)

One-hour coherent optical storage in an atomic frequency comb memory. Nature Communications 12, 2381 (2021) 

Nonclassical photon-pair source based on noiseless photon echo. Phys. Rev A 107, 042619 (2023)