Toward the Device-Independent Certification of a Quantum Memory

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.