80 research outputs found
Semi-device-independent security of one-way quantum key distribution
By testing nonlocality, the security of entanglement-based quantum key
distribution (QKD) can be enhanced to being 'device-independent'. Here we ask
whether such a strong form of security could also be established for one-way
(prepare and measure) QKD. While fully device-independent security is
impossible, we show that security can be guaranteed against individual attacks
in a semi-device-independent scenario. In the latter, the devices used by the
trusted parties are non-characterized, but the dimensionality of the quantum
systems used in the protocol is assumed to be bounded. Our security proof
relies on the analogies between one-way QKD, dimension witnesses and
random-access codes.Comment: 5 pages, 1 figur
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