Ab-initio experimental violation of Bell inequalities
- URL: http://arxiv.org/abs/2108.00574v1
- Date: Mon, 2 Aug 2021 00:39:52 GMT
- Title: Ab-initio experimental violation of Bell inequalities
- Authors: Davide Poderini, Emanuele Polino, Giovanni Rodari, Alessia Suprano,
Rafael Chaves and Fabio Sciarrino
- Abstract summary: violation of a Bell inequality is the paradigmatic example of device-independent quantum information.
In practice, all Bell experiments rely on the precise understanding of the underlying physical mechanisms.
We propose and experimentally implement a solution to this ab-initio task.
Treating preparation and measurement devices as black-boxes, and relying on the observed statistics only, our adaptive protocol approaches the optimal Bell inequality violation.
- Score: 0.9786690381850356
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: The violation of a Bell inequality is the paradigmatic example of
device-independent quantum information: the nonclassicality of the data is
certified without the knowledge of the functioning of devices. In practice,
however, all Bell experiments rely on the precise understanding of the
underlying physical mechanisms. Given that, it is natural to ask: Can one
witness nonclassical behaviour in a truly black-box scenario? Here we propose
and implement, computationally and experimentally, a solution to this ab-initio
task. It exploits a robust automated optimization approach based on the
Stochastic Nelder-Mead algorithm. Treating preparation and measurement devices
as black-boxes, and relying on the observed statistics only, our adaptive
protocol approaches the optimal Bell inequality violation after a limited
number of iterations for a variety photonic states, measurement responses and
Bell scenarios. In particular, we exploit it for randomness certification from
unknown states and measurements. Our results demonstrate the power of automated
algorithms, opening a new venue for the experimental implementation of
device-independent quantum technologies.
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