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Phys Rev Lett. 2017 Apr 7;118(14):140402. doi: 10.1103/PhysRevLett.118.140402. Epub 2017 Apr 5.

Random Number Generation with Cosmic Photons.

Wu C1,2, Bai B1,2, Liu Y1,2, Zhang X3, Yang M1,2, Cao Y1,2, Wang J3, Zhang S4, Zhou H4, Shi X4, Ma X5, Ren JG1,2, Zhang J1,2, Peng CZ1,2, Fan J1,2, Zhang Q1,2, Pan JW1,2.

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Shanghai Branch, Department of Modern Physics and National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Shanghai 201315, China.
CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.
Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China.
Polar Research Institute of China, Shanghai 200136, China.
Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, China.


Random numbers are indispensable for a variety of applications ranging from testing physics foundations to information encryption. In particular, nonlocality test provide strong evidence for our current understanding of nature-quantum mechanics. All the random number generators (RNGs) used for the existing tests are constructed locally, making the test results vulnerable to the freedom-of-choice loophole. We report an experimental realization of RNGs based on the arrival time of cosmic photons. The measurement outcomes (raw data) pass the standard NIST statistical test suite. We present a realistic design to employ these RNGs in a Bell test experiment, which addresses the freedom-of-choice loophole.

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