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Random numbers are essential for applications ranging from securecommunications to numerical simulation and quantitative finance. Algorithms canrapidly produce pseudo-random outcomes, series of numbers that mimic mostproperties of true random numbers while quantum random number generators(QRNGs) exploit intrinsic quantum randomness to produce true random numbers.Single-photon QRNGs are conceptually simple but produce few random bits perdetection. In contrast, vacuum fluctuations are a vast resource for QRNGs: theyare broad-band and thus can encode many random bits per second. Directrecording of vacuum fluctuations is possible, but requires shot-noise-limiteddetectors, at the cost of bandwidth. We demonstrate efficient conversion ofvacuum fluctuations to true random bits using optical amplification of vacuumand interferometry. Using commercially-available optical components wedemonstrate a QRNG at a bit rate of 1.11 Gbps. The proposed scheme has thepotential to be extended to 10 Gbps and even up to 100 Gbps by taking advantageof high speed modulation sources and detectors for optical fibertelecommunication devices.

True random numbers from amplified quantum vacuum