Quantum memories are one of the building blocks of the future quantum internet. Without them, it would be rather impossible to transmit quantum information over long distances and expand into a real quantum network. These memories have the mission of receiving the quantum information encoded in a photon in the form of qubits, storing it and then retrieving it. Quantum memories can be realized in different material systems, for example ensembles of cold atoms or doped crystals.
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Source: Phys.org