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Pavel Sekatski1, Jean-Daniel Bancal2, Marie Ioannou1

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We developed efficient methods to certify quantum memories, crucial for quantum networks. Our device-independent approach robustly self-tests these memories, achieving high fidelity in experiments.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication Technology

Background:

  • Quantum memories are essential components for building future quantum communication networks.
  • Certifying the performance and reliability of quantum memories is a critical challenge for their practical implementation.

Purpose of the Study:

  • To develop efficient and robust certification methods for quantum memories.
  • To enable device-independent certification, minimizing assumptions about the underlying hardware.
  • To demonstrate the practical applicability of the developed methods in real-world experiments.

Main Methods:

  • Development of device-independent certification protocols for quantum memories.
  • Implementation of a robust self-testing method for quantum memory characterization.
  • Application of the method in a relaxed scenario for a solid-state ensemble quantum memory.

Main Results:

  • Successful development of efficient certification methods for quantum memories.
  • Demonstration of a robust self-testing technique applicable in a device-independent manner.
  • Certification of a fidelity of 0.87 in a recent solid-state ensemble quantum memory experiment.

Conclusions:

  • The developed methods provide efficient and robust certification for quantum memories.
  • The device-independent approach enhances the trustworthiness of quantum memory characterization.
  • These techniques are broadly applicable to any device implementing a qubit identity quantum channel.