Masaki Owari

In most of the security proofs of continuous variable quantum key distribution (CV-QKD), except for the security proof of an entangle-based protocol by F. Furrer et. al. [Phys. Rev. Lett. 109 , 100502 (2012)], it is required that Bob’s local oscillator (LO) for homodyne or heterodyne measurements is perfectly prepared. Since Eve can freely manipulate LO transmitted from Alice to Bob in standard CV-QKD systems, this requirement cannot be met. Moreover, the requirement includes the assumption that the intensity of Bob’s LO must be infinite, which is impossible to achieve in reality. In this work, we fill the gap between a standard CV-QKD system and the existing security proofs by providing a security proof accommodating the manipulation of LO by Eve.