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Random numbers are commonly used in many different fields, ranging fromsimulations in fundamental science to security applications. In some criticalcases, as Bell's tests and cryptography, the random numbers are required to beboth secure (i.e. known only by the legitimate user) and to be provided at anultra-fast rate (i.e. larger than Gbit/s). However, practical generators areusually considered trusted, but their security can be compromised in case ofimperfections or malicious external actions. In this work we introduce anefficient protocol which guarantees security and speed in the generation. Wepropose a novel source-device-independent protocol based on generic PositiveOperator Valued Measurements and then we specialize the result to heterodynemeasurements. The security of the generated numbers is proven without anyassumption on the source, which can be even fully controlled by an adversary.Furthermore, we experimentally implemented the protocol by exploitingheterodyne measurements, reaching an unprecedented secure generation rate of17.42 Gbit/s, without the need to take into account finite-size effects. Ourdevice combines simplicity, ultrafast-rates and high security with low costcomponents, paving the way to new practical solutions for random numbergeneration.

Secure heterodyne-based quantum random number generator at 17 Gbps