Reliable and unbiased random numbers are needed for a range of applications spanning from numerical modeling to cryptographic communications. While there are algorithms that can generate pseudo random numbers, they can never be perfectly random nor indeterministic.

Researchers at the ANU are generating true random numbers from a physical quantum source. We do this by splitting a beam of light into two beams and then measuring the power in each beam.  Because light is quantised, the light intensity in each beam fluctuates about the mean.  Those fluctuations, due ultimately to the quantum vacuum, can be converted into a source of random numbers. Every number is randomly generated in real time and cannot be predicted beforehand. So if you need some really random numbers, use the link below!

Papers on Random Number Generators

Real time demonstration of high bitrate quantum random number generation with coherent laser light
T. Symul, S. M. Assad, and P. K. Lam
Appl. Phys. Lett. 98, 231103 (2011)

Links to sites on Random Number Generators


Quantum Random Number Generator

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Ben Buchler