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Random numbers are widely used for information security, cryptography,stochastic modeling, and quantum simulations. Key technical challenges forphysical random number generation are speed and scalability. We demonstrate amethod for ultrafast generation of hundreds of random bit streams in parallelwith a single laser diode. Spatio-temporal interference of many lasing modes ina specially designed cavity is introduced as a scheme for greatly acceleratedrandom bit generation. Spontaneous emission, caused by quantum fluctuations,produces stochastic noise that makes the bit streams unpredictable. We achievea total bit rate of 250 terabits per second with off-line post-processing,which is more than two orders of magnitude higher than the currentpost-processing record. Our approach is robust, compact, and energy efficientwith potential applications in secure communication and high-performancecomputation.

Massively parallel ultrafast random bit generation with a chip-scale laser