Experimental device-independent certified randomness generation with an instrumental causal structure

• Autor(a) principal: Agresti, Iris
• Data de Publicação: 2020
• Outros Autores: Poderini, Davide, Guerini, Leonardo, Mancusi, Michele, Carvacho, Gonzalo, Aolita, Leandro, Cavalcanti, Daniel, Araújo, Rafael Chaves Souto, Sciarrino, Fábio
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/jspui/handle/123456789/30090
• topic: Quantum physics; Randomness-generation protocol

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