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The speed of a quantum random number generator is essential for practicalapplications, such as high-speed quantum key distribution systems. Here, wepush the speed of a quantum random number generator to 68 Gbps by operating alaser around its threshold level. To achieve the rate, not only high-speedphotodetector and high sampling rate are needed, but also a very stableinterferometer is required. A practical interferometer with active feedbackinstead of common temperature control is developed to meet requirement ofstability. Phase fluctuations of the laser are measured by the interferometerwith a photodetector, and then digitalized to raw random numbers with a rate of80 Gbps. The min-entropy of the raw data is evaluated by modeling the systemand is used to quantify the quantum randomness of the raw data. The bias of theraw data caused by other signals, such as classical and detection noises, canbe removed by Toeplitz-matrix hashing randomness extraction. The final randomnumbers can pass through the standard randomness tests. Our demonstration showsthat high-speed quantum random number generators are ready for practical usage.

68 Gbps quantum random number generation by measuring laser phase fluctuations