Agresti, IrisPoderini, DavideGuerini, Leonardo [UNESP]Mancusi, MicheleCarvacho, GonzaloAolita, LeandroCavalcanti, DanielChaves, RafaelSciarrino, Fabio2020-12-122020-12-122020-12-01Communications Physics, v. 3, n. 1, 2020.2399-3650http://hdl.handle.net/11449/200625The intrinsic random nature of quantum physics offers novel tools for the generation of random numbers, a central challenge for a plethora of fields. Bell non-local correlations obtained by measurements on entangled states allow for the generation of bit strings whose randomness is guaranteed in a device-independent manner, i.e. without assumptions on the measurement and state-generation devices. Here, we generate this strong form of certified randomness on a new platform: the so-called instrumental scenario, which is central to the field of causal inference. First, we theoretically show that certified random bits, private against general quantum adversaries, can be extracted exploiting device-independent quantum instrumental-inequality violations. Then, we experimentally implement the corresponding randomness-generation protocol using entangled photons and active feed-forward of information. Moreover, we show that, for low levels of noise, our protocol offers an advantage over the simplest Bell-nonlocality protocol based on the Clauser-Horn-Shimony-Holt inequality.engArtigo10.1038/s42005-020-0375-62-s2.0-85086714498