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We experimentally demonstrate an all-optical random number generator based onspontaneous symmetry breaking in a coherently-driven Kerr resonator. Random bitsequences are generated by repeatedly tuning a control parameter across asymmetry-breaking bifurcation that enacts random selection between two possiblesteady-states of the system. Experiments are performed in a fibre ringresonator, where the two symmetry-broken steady-states are associated withorthogonal polarization modes. Detrimental biases due to system asymmetries arecompletely suppressed by leveraging a recently-discovered self-symmetrizationphenomenon that ensures the symmetry breaking acts as an unbiased coin toss,with a genuinely random selection between the two available steady-states. Weoptically generate bits at a rate of over 3~MHz without post-processing andverify their randomness using the National Institute of Standards andTechnology and Dieharder statistical test suites.

Random number generation using spontaneous symmetry breaking in a Kerr resonator