Security of distributed-phase-reference quantum key distribution

Tobias Moroder, Marcos Curty, Charles Ci Wen Lim, Le Phuc Thinh, Hugo Zbinden, Nicolas Gisin

Published 2012-07-23Version 1

Distributed-phase-reference quantum key distribution stands out for its easy implementation with present day technology. Since many years, a full security proof of these schemes in a realistic setting has been elusive. For the first time, we solve this long standing problem and present a generic method to prove the security of such protocols against general attacks. To illustrate our result we provide lower bounds on the key generation rate of a variant of the coherent-one-way quantum key distribution protocol. In contrast to standard predictions, it appears to scale quadratically with the system transmittance.