# Practical device-independent quantum cryptography via entropy accumulation

Article · Rotem Arnon-Friedman, Frédéric Dupuis, Omar Fawzi, Renato Renner, Thomas Vidick

- Archive id: doi:10.1038/s41467-017-02307-4
- Published: 2018-01-25
- Venue: Nature Communications
- DOI: https://doi.org/10.1038/s41467-017-02307-4
- PMID: 29386507
- Citations: 271
- Source URL: https://doi.org/10.1038/s41467-017-02307-4
- PDF: https://www.nature.com/articles/s41467-017-02307-4.pdf
- Provenance: openalex

## Abstract

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. Here we present a property of entropy, termed "entropy accumulation", which asserts that the total amount of entropy of a large system is the sum of its parts. We use this property to prove the security of cryptographic protocols, including device-independent quantum key distribution, 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.

_Abstract reproduced under CC-BY (publisher license, via OpenAlex)._

Topics: [Quantum Foundations](https://space-kitty.com/topics/quantum-foundations)

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