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Experimental Realization of Device-Independent Quantum Randomness Expansion
Ming-Han Li1,2, Xingjian Zhang3, Wen-Zhao Liu1,2
1Shanghai Branch, National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Shanghai 201315, People's Republic of China.
Physical Review Letters
|February 19, 2021
Summary
Researchers experimentally demonstrated device-independent quantum randomness expansion, generating secure quantum-proof random bits from less entropy. This breakthrough advances quantum randomness and its applications.
Area of Science:
- Quantum Information Science
- Quantum Cryptography
Background:
- Classical physics prohibits generating longer random sequences from shorter ones.
- Quantum mechanics allows randomness expansion, with device-independent protocols offering the highest security.
- Quantum side information poses a challenge to the security of randomness expansion.
Purpose of the Study:
- To experimentally realize device-independent quantum randomness expansion.
- To achieve security against quantum side information using quantum probability estimation.
- To establish a foundation for quantum-certifiable random bit applications.
Main Methods:
- Experimental implementation of device-independent quantum randomness expansion.
- Utilizing quantum probability estimation to bound quantum side information.
- Generating and verifying quantum-proof random bits.
Main Results:
- First experimental realization of device-independent quantum randomness expansion secure against quantum side information.
- Generation of 5.47×10⁸ quantum-proof random bits from 4.39×10⁸ bits of entropy.
- Achieved a randomness expansion of 1.08×10⁸ bits with a total soundness error of 4.6×10⁻¹⁰.
Conclusions:
- Device-independent quantum randomness expansion is experimentally viable and secure.
- This work significantly advances the understanding and application of quantum randomness.
- Provides a robust foundation for future quantum-certifiable random bit technologies.
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