Contextuality offers security
Karol Horodecki, Michal Horodecki, Pawel Horodecki, Ryszard Horodecki,, Marcin Pawlowski, Mohamed Bourennane

TL;DR
This paper introduces a novel quantum cryptographic protocol based on contextuality, demonstrating that the fundamental quantum feature of information-disturbance trade-off can be used to ensure security, even with untrusted devices.
Contribution
It presents the first operational protocol leveraging quantum contextuality, specifically Kochen-Specker paradox conditions, for device-independent cryptography.
Findings
Secure key can be extracted using systems exhibiting Kochen-Specker paradox conditions.
The protocol is the first to directly implement the fundamental quantum trade-off between information gain and disturbance.
It provides a practical, device-independent quantum cryptographic scheme compatible with current technology.
Abstract
The discovery of quantum key distribution by Bennett and Brassard (BB84) bases on the fundamental quantum feature: incompatibility of measurements of quantum non-commuting observables. In 1991 Ekert showed that cryptographic key can be generated at a distance with help of entangled (correlated) quantum particles. Recently Barrett, Hardy and Kent showed that the non-locality used by Ekert is itself a good resource of cryptographic key even beyond quantum mechanics. Their result paved the way to new generation of quantum cryptographic protocols - secure even if the devices are built by the very eavesdropper. However, there is a question, which is fundamental from both practical and philosophical point of view: does Nature offer security on operational level based on the original concept behind quantum cryptography - that information gain about one bservables must cause disturbance to…
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Taxonomy
TopicsQuantum Mechanics and Applications
