2011/03/31 by Marcin Pawlowski, Nicolas Brunner
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physreva.84.010302
published as Phys. Rev. A 84, 010302(R) (2011) · 5 pages, 1 figure
arxiv created 2011/07/15 · arxiv updated 2011/07/18
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.