Toward the Device-Independent Certification of a Quantum Memory

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 characterization of so...

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Bibliographic Details
Published in:Physical review letters 2023-10, Vol.131 (17), p.170802-170802, Article 170802
Main Authors: Sekatski, Pavel, Bancal, Jean-Daniel, Ioannou, Marie, Afzelius, Mikael, Brunner, Nicolas
Format: Article
Language:English
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Summary: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 characterization 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 characterization of any device implementing a qubit identity quantum channel.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.131.170802