Characterization of the hyperfine properties for quantum memory application

Quantum repeaters have strong requirements for quantum memory properties, namely on the efficiency, storage time, and fidelity (a measure of how close the output state is to the input). In our group, we use rare-earth-ion-doped crystals as quantum memories. In a previous work, we have demonstrated storage times up to 1.5 ms in our Europium-doped yttrium orthosilicate crystal. In a new study recently published in Physical Review B, we have characterized fully the ground and excited spin state properties of the relevant optical transition under external magnetic fields. This paves the way towards the realization of a quantum memory with longer storage times by using dynamical decoupling. These developments are very exciting as they should take our memory storage time beyond the minimal requirement for a quantum communication.

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