Experimentally Robust Self-testing for Bipartite and Tripartite Entangled States

Area of Science:

• Quantum Information Science
• Quantum Foundations
• Experimental Quantum Physics

Background:

• Self-testing enables device-independent verification of quantum systems.
• Entangled states are crucial for quantum information processing.
• Understanding the robustness of self-testing criteria is vital for practical applications.

Purpose of the Study:

• To experimentally investigate recently derived analytic self-testing bounds.
• To demonstrate the validity of these bounds for bipartite and tripartite systems.
• To showcase robust self-testing of quantum entanglement.

Main Methods:

• Utilized high-quality two-qubit and three-qubit entanglement sources.
• Experimentally tested Kaniewski's analytic self-testing bounds.
• Prepared and analyzed various entangled states.

Main Results:

• The derived self-testing bounds were experimentally validated.
• The bounds proved valid across different prepared entangled states.
• A proof-of-concept for robust self-testing was successfully demonstrated.

Conclusions:

• The experimental results confirm the validity of the analytic self-testing bounds.
• This work provides a significant improvement in demonstrating robust self-testing.
• The findings enhance the practical applicability of device-independent quantum protocols.