Device-independent quantum authorization based on the Clauser-Horne-Shimony-Holt game

In the spirit of device-independent cryptography, we present a two-party quantum authorization primitive with nonlocality as its fueling resource. Therein, users are attributed authorization levels granting them access to a private database accordingly. The authorization levels are encoded in the nonlocal resources distributed to the users and subsequently confirmed by their ability to win Clauser-Horne-Shimony-Holt games using such resources. We formalize the protocol, prove its security, and frame it in a device-independent setting employing the notion of Clauser-Horne-Shimony-Holt self-testing via simulation. Finally, we provide a proof-of-concept implementation using the QISKIT open-source framework.

Automated summary

In this study, a two-party quantum authorization primitive fueled by nonlocality is proposed. Users are granted access to a private database based on their authorization levels encoded in nonlocal resources, confirmed through winning games. The protocol is formalized, proven secure, and framed in a device-independent setting, with a proof-of-concept implementation using the QISKIT open-source framework.