  Quantum memories represent one of the main ingredients of future quantum
communication networks. Their certification is therefore a key challenge. Here
we develop efficient certification methods for quantum memories. Considering a
device-independent approach, where no a priori characterisation of sources or
measurement devices is required, we develop a robust self-testing method for
quantum memories. We then illustrate the practical relevance of our technique
in a relaxed scenario by certifying a fidelity of 0.87 in a recent solid-state
ensemble quantum memory experiment. More generally, our methods apply for the
characterisation of any device implementing a qubit identity quantum channel.
