Sequential attacks against differential-phase-shift quantum key distribution with weak coherent states

Authors:
Marcos Curty;Lucy Liuxuan Zhang;Hoi-Kwong Lo;Norbert Lütkenhaus
Affiliations:
Center for Quantum Information and Quantum Control, Department of Physics, and Department of Electrical & Computer Engineering, University of Toronto, Toronto, Ontario, Canada and Institute fo ...;Center for Quantum Information and Quantum Control, Department of Physics, and Department of Electrical & Computer Engineering, University of Toronto, Toronto, Ontario, Canada;Center for Quantum Information and Quantum Control, Department of Physics, and Department of Electrical & Computer Engineering, University of Toronto, Toronto, Ontario, Canada;Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario, Canada and Institut für Theoretische Physik, Institute of Optics, Information and Photonics, Universität Erlan ...
Venue:
Quantum Information & Computation
Year:
2007

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Abstract

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 a special type of intercept-resend attacks and, therefore, they provide ultimate upper bounds on the maximal distance achievable by quantum key distribution schemes.