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Updated: Sep 12, 2025
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
9.7K
Complete Self-Testing of a System of Remote Superconducting Qubits
Simon Storz1,2, Anatoly Kulikov1,2, Josua D Schär1,2
1ETH Zurich, Department of Physics, 8093 Zurich, Switzerland.
Physical Review Letters
|August 4, 2025
Summary
We demonstrate device-independent self-testing of quantum systems using superconducting circuits. This allows for secure characterization of quantum computing hardware without needing to know its internal workings.
Area of Science:
- Quantum Information Science
- Superconducting Quantum Computing
- Device-Independent Quantum Information
Background:
- Self-testing protocols offer device-independent certification of quantum systems.
- Superconducting circuits are a leading platform for quantum computing.
Purpose of the Study:
- To develop and demonstrate device-independent self-testing protocols for superconducting circuits.
- To enable robust characterization of quantum hardware without internal knowledge.
Main Methods:
- Developed theoretical framework for self-testing Pauli measurements.
- Performed simultaneous self-testing of Bell pair generation and measurements on entangled superconducting circuits.
- Conducted experiments with 17 million trials on circuits separated by 30 meters.
Main Results:
- Achieved an average Clauser-Horne-Shimony-Holt (CHSH) S value of 2.236.
- Certified an average Bell state fidelity of at least 58.9% (99% confidence).
- Certified an average measurement fidelity of at least 89.5% (99% confidence).
Conclusions:
- Successfully demonstrated device-independent self-testing for superconducting quantum systems.
- Established high standards for quantum characterization in a practical setting.
- Opens avenues for secure distributed quantum computing and communication.
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