Towards the device-independent certification of a quantum memory

Abstract

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.

5+11 pages, 1 figure

References in corpus (6)

• The Quantum Internet
• Towards a global quantum network
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• Robust and versatile black-box certification of quantum devices
• Verifying the quantumness of a channel with an untrusted device
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• Experimentally Certified Transmission of a Quantum Message through an Untrusted and Lossy Quantum Channel via Bell's Theorem
• Robust self-testing and certified randomness based on chained Bell inequality
• Barycentric decomposition for quantum instruments
• Randomness-free Detection of Non-projective Measurements: Qubits & beyond
• Semi-device-independent certification of high-dimensional quantum channels