Practical device-independent quantum cryptography via entropy accumulation

Rotem Arnon-Friedman (), Frédéric Dupuis, Omar Fawzi, Renato Renner and Thomas Vidick
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Rotem Arnon-Friedman: ETH-Zürich
Frédéric Dupuis: Masaryk University
Omar Fawzi: ENS de Lyon
Renato Renner: ETH-Zürich
Thomas Vidick: California Institute of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-11

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-017-02307-4

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