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Long-duration quantum memories for photonic qubits are essential componentsfor achieving long-distance quantum networks and repeaters. The mapping ofoptical states onto coherent spin-waves in rare earth ensembles is aparticularly promising approach to quantum storage. However, it remainschallenging to achieve long-duration storage at the quantum level due toread-out noise caused by the required spin-wave manipulation. In this work, weapply dynamical decoupling techniques and a small magnetic field to achieve thestorage of six temporal modes for 20, 50 and 100 ms in a$^{151}$Eu$^{3+}$:Y$_2$SiO$_5$ crystal, based on an atomic frequency combmemory, where each temporal mode contains around one photon on average. Thequantum coherence of the memory is verified by storing two time-bin qubits for20 ms, with an average memory output fidelity of $F=(85\pm 2)\%$ for an averagenumber of photons per qubit of $\mu_\text{in}$ = 0.92$\pm$0.04. The qubitanalysis is done at the read-out of the memory, using a type of compositeadiabatic read-out pulse we developed.

Storage of photonic time-bin qubits for up to 20 ms in a rare-earth doped crystal