Device-independent quantum cryptography

Device-independent cryptography goes beyond conventional quantum cryptography by providing security that holds independently of the quality of the underlying physical devices. Device-independent protocols are based on the quantum phenomena of non-locality and the violation of Bell inequalities. This high level of security could so far only be established under conditions which are not achievable experimentally.In this talk, I will present a recent work in which we prove the security of device-independent cryptographic protocols in a modular way, while achieving essentially optimal parameters. Recent experimental progress, which enabled loophole-free Bell tests, suggests that the achieved parameters are technologically accessible. Our work hence provides the theoretical groundwork for experimental demonstrations of device-independent cryptography.

Based on:

* Rotem Arnon-Friedman, Renato Renner, & Thomas Vidick.  “Simple and tight device-independent security proofs.” SIAM Journal on Computing, 48(1),  (2019).
* Rotem Arnon-Friedman, Frédéric Dupuis, Omar Fawzi, Renato Renner, and Thomas Vidick.
“Practical device-independent quantum cryptography via entropy accumulation.” Nature communications 9, no. 1 (2018).