Quantum key distribution with key extracted from basis information

TL;DR

This paper proposes a quantum key distribution protocol that extracts the secure key from measurement basis information instead of outcomes, enhancing robustness against certain attacks without hardware changes.

Contribution

It introduces a novel QKD protocol that derives keys from basis choices, improving security against detector and photon-number-splitting attacks.

Findings

More robust against detector efficiency attacks

Enhanced security with practical detectors and sources

No hardware modifications needed

Abstract

In conventional quantum key distribution protocols, the secure key is normally extracted from the measurement outcomes of the system. Here, a different approach is proposed, where the secure key is extracted from the measurement bases, rather than outcomes. Compared to the original Bennett-Brassard-1984 protocol, the proposed protocol involves no hardware change but modifications in data postprocessing. We show that this protocol is more robust against detector efficiency attacks and photon-number-splitting attacks when practical detectors and photon sources are used.