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The researchers from the ANU ARC Centre of Excellence for Quantum Computation and Communication Technology have used very sensitive light detectors to listen to vacuum.
Quantum mechanics says that vacuum is not empty but has virtual sub-atomic particles spontaneously appearing and disappearing, which gives rise to quantum random noise. That noise can be used to generate billions of random numbers per second and their unpredictability is guaranteed by quantum theory.
You can get some live quantum random numbers here
On the left is a random scatter plot generated with quantum random numbers.
Here is scientific information on ANU Quantum Random Number Generator.
Read more.