Artículos de revistas
Experimental device-independent certified randomness generation with an instrumental causal structure
Fecha
2020-12-01Registro en:
Communications Physics, v. 3, n. 1, 2020.
2399-3650
10.1038/s42005-020-0375-6
2-s2.0-85086714498
Autor
Sapienza Università di Roma
Universidade Estadual Paulista (Unesp)
Universidade Federal do Rio de Janeiro (UFRJ)
The Barcelona Institute of Science and Technology
Federal University of Rio Grande do Norte
Institución
Resumen
The 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.