Randomness Expansion Secured by Quantum Contextuality

@article{Um2020RandomnessES,
  title={Randomness Expansion Secured by Quantum Contextuality},
  author={Mark Um and Qi Zhao and Junhua Zhang and Pengfei Wang and Ye Wang and Mu Qiao and Hongyi Zhou and Xiongfeng Ma and Kihwan Kim},
  journal={Physical Review Applied},
  year={2020}
}
The output randomness from a random number generator can be certified by observing the violation of quantum contextuality inequalities based on the Kochen-Specker theorem. Contextuality can be tested in a single quantum system, which significantly simplifies the experimental requirements to observe the violation comparing to the ones based on nonlocality tests. However, it is not yet resolved how to ensure compatibilities for sequential measurements that is required in contextuality tests. Here… 
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