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Experimentally Self-Testing Partially Entangled Two-Qubit States on an Optical Platform
Xin Zhao1, Yan-Han Yang1, Li-Ming Zhao1
1School of Information Science and Technology, Southwest Jiaotong University, Chengdu 610031, China.
Entropy (Basel, Switzerland)
|January 28, 2026
Summary
Researchers developed a self-testing protocol for quantum entanglement, simplifying verification without full reconstruction. This advances device-independent quantum information processing.
Area of Science:
- Quantum Information Science
- Experimental Quantum Physics
Background:
- Quantum entanglement is crucial for quantum information processing.
- Device-independent protocols enhance security and reliability.
- Full quantum state tomography is resource-intensive.
Purpose of the Study:
- To demonstrate a complete and experimentally validated self-testing protocol for two-qubit partially entangled states.
- To develop a method that avoids the need for full tomographic reconstruction.
- To establish a foundation for device-independent quantum information processing.
Main Methods:
- Utilized a room-temperature type-II PPKTP polarization-entangled source.
- Employed a free-space optical setup.
- Integrated quantum state tomography and optimal generalized Bell measurements within a single system.
Main Results:
- Achieved high-fidelity self-testing of non-maximally entangled states.
- Successfully validated the self-testing protocol experimentally.
- Demonstrated the protocol under black-box assumptions.
Conclusions:
- The developed protocol offers an efficient method for verifying quantum entanglement.
- This work provides a significant step towards practical device-independent quantum information processing.
- The experimental validation confirms the robustness and feasibility of the approach.
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