Abstract
Randomness expansion where one generates a longer sequence of random numbers from a short one is viable in quantum mechanics but not allowed classically. Device-independent quantum randomness expansion provides a randomness resource of the highest security level. Here, we report the first experimental realization of device-independent quantum randomness expansion secure against quantum side information established through quantum probability estimation. We generate quantum-proof random bits while consuming of entropy, expanding our store of randomness by at a latency of about 13.1 h, with a total soundness error . Device-independent quantum randomness expansion not only enriches our understanding of randomness but also sets a solid base to bring quantum-certifiable random bits into realistic applications.
- Received 18 October 2020
- Accepted 4 January 2021
DOI:https://doi.org/10.1103/PhysRevLett.126.050503
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