Beamsplitting attack to the revised KKKP protocol and a possible solution

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/110574We show that the revised KKKP protocol proposed by Kye and Kim [Phys. Rev. Lett. 95,040501(2005)] is still insecure with coherent states by a type of beamsplitting attack. We then further revise the KKKP protocol so that it is secure under such type of beamsplitting attack. The revised scheme can be used for not-so-weak coherent state quantum key distribution.6pages, 1 figureQuantum PhysicsBeamsplitting attack to the revised KKKP protocol and a possible solutiontext