Performance of continuous variable quantum key distribution system at different detector bandwidth

OPTICS COMMUNICATIONS

卷:471

Article

Tang, X.¹  Kumar, R.²  Ren, S.¹  Wonfor, A.¹  Penty, R. V.¹  White, I. H.^1,3 

[1] Univ Cambridge, Elect Div, Dept Engn, Ctr Photon Syst, Cambridge CB3 0FA, England

[2] Univ York, Dept Phys, Quantum Commun Hub, York YO10 5DD, N Yorkshire, England

[3] Univ Bath, Bath BA2 7AY, Avon, England

关键词: Quantum key distribution;    Continuous variable quantum key distribution;    Balanced homodyne detector;    Gaussian modulated coherent state protocol;   

DOI  :  10.1016/j.optcom.2020.126034

来源: Elsevier

【 摘 要 】

We evaluate the performance of Gaussian Modulated Coherent State (GMCS) Continuous-Variable Quantum Key Distribution (CV-QKD), in terms of secure key rate, at different detector bandwidths. We illustrate the advantages and limitations of high-speed CV-QKD systems using a general noise model in which we consider various noise sources and their dependence upon detection bandwidth. Experimentally, the feasibility of high speed CV-QKD is demonstrated by using a GHz bandwidth balanced homodyne detector (BHD) established with commercially available components. We provide secure key rates of transmitted and local local oscillator schemes under various clock rates.

【 授权许可】

Free