Story perspectives

ETH Zurich Achieves Device-Independent Randomness Amplification in Billion-Trial Bell Test

6/3/2026

Summary

Story summary

ETH Zurich physicists demonstrated device-independent randomness amplification, generating random numbers from an imperfect source.
They ran a billion Bell-test trials in nine hours with two qubits 30 meters apart, cooled to absolute zero and entangled via photons.
The correlations cannot be explained by hidden-variable models, confirming that randomness amplification is impossible.
Researchers say the sequence could act as a certified randomness source, like atomic clocks, with the findings published in Nature.

1 of 1

Story summary

ETH Zurich physicists demonstrated device-independent randomness amplification, generating random numbers from an imperfect source.
They ran a billion Bell-test trials in nine hours with two qubits 30 meters apart, cooled to absolute zero and entangled via photons.
The correlations cannot be explained by hidden-variable models, confirming that randomness amplification is impossible.
Researchers say the sequence could act as a certified randomness source, like atomic clocks, with the findings published in Nature.