Tang X, Kumar R, Ren S, Wonfor A, Penty R V, White I H, 2020, ‘Performance of continuous variable quantum key distribution system at different detector bandwidth’, Optics Communications, first published online on 27 Apr 2020. DOI: 10.1016/j.optcom.2020.126034
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.