Sequential attacks against differential-phase-shift quantum key distribution with weak coherent states
Marcos Curty, Lucy Liuxuan Zhang, Hoi‐Kwong Lo, Norbert Lütkenhaus · CERN Document Server (European Organization for Nuclear Research) · 2007
We investigate limitations imposed by sequential attacks on the performance of differential-phase-shift quantum key distribution protocols that use pulsed coherent light. In particular, we analyze two sequential attacks based on unambiguous state discrimination and minimum error discrimination, respectively, of the signal states emitted by the source. Sequential attacks represent;I special type of intercept-resend attacks and, therefore, they provide ultimate upper bounds on the maximal distance achievable by quantum key distribution schemes.