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Random number generation is an enabling technology for fields as varied asMonte Carlo simulations and quantum information science. An importantapplication is a secure quantum key distribution (QKD) system; here, we proposeand demonstrate an approach to random number generation that satisfies thespecific requirements for QKD. In our scheme, vacuum fluctuations of theelectromagnetic-field inside a laser cavity are sampled in a discrete manner intime and amplified by injecting current pulses into the laser. Random numberscan be obtained by interfering the laser pulses with another independent laseroperating at the same frequency. Using only off-the-shelf opto-electronics andfibre-optics components at 1.5 $\mu$m wavelength, we experimentally demonstratethe generation of high-quality random bits at a rate of up to 1.5 GHz. Ourresults show the potential of the new scheme for practical informationprocessing applications.

Practical quantum random number generator based on sampling vacuum fluctuations