Open AccessRF-subcarrier-assisted four-state continuous-variable QKD based on coherent detection
Author(s) -
Zhen Qu,
Ivan B. Djordjević,
Mark A. Neifeld
Publication year - 2016
Publication title -
optics letters/optics index
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.41.005507
Subject(s) - quantum key distribution , phase noise , optics , subcarrier , local oscillator , transmission (telecommunications) , photonics , transmittance , quantum cryptography , noise (video) , physics , computer science , telecommunications , quantum , quantum information , photon , orthogonal frequency division multiplexing , channel (broadcasting) , quantum mechanics , artificial intelligence , image (mathematics)
We theoretically investigate and experimentally demonstrate a RF-assisted four-state continuous-variable quantum key distribution (CV-QKD) system. Classical coherent detection is implemented with a simple digital phase noise cancelation scheme. In the proposed system, there is no need for frequency and phase locking between the quantum signals and the local oscillator laser. Moreover, in principle, there is no residual phase noise, and a mean excess noise of 0.0115 (in shot-noise units) can be acquired experimentally. In addition, the minimum transmittance of 0.45 is reached experimentally for secure transmission with commercial photodetectors, and the maximum secret key rate (SKR) of >12 Mbit/s can be obtained. The proposed RF-assisted CV-QKD system opens the door of incorporating microwave photonics into a CV-QKD system and improving the SKR significantly.