Performance of continuous variable quantum key distribution system at different detector bandwidth
Xinke Tang, Rupesh Kumar, S. Ren, A. Wonfor, RV Penty, I.H. White
Abstract
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.
Topics & Concepts
Quantum key distributionDetectorBandwidth (computing)Local oscillatorKey (lock)GaussianPhysicsOpticsComputer scienceContinuous variableCoherent statesDirect-conversion receiverQuantumElectronic engineeringTelecommunicationsPhase noiseQuantum mechanicsMathematicsEngineeringPhotonComputer securityMathematical optimizationQuantum Information and CryptographyQuantum Computing Algorithms and ArchitectureQuantum Mechanics and Applications