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We demonstrate a simple scheme for generating certifiable quantum random numbers considering the imperfections in quantum devices employed. Particularly, we show low-latency real-time randomness generation from measurements on photonic time-bin states. Every 0.12s, we certify enough entropy against a quantum adversary to generate a block of 8192 random bits with a certified error bounded by 10-20. It can be run continuously and is thus well suited as a quantum randomness beacon.

We generated time-multiplexed degenerate optical parametric oscillator pulses using a nonlinear fiber Sagnac interferometer. We confirmed that the phases of pulses were bifurcated to 0 or n, which makes them useful for simulating Ising spins.