Finding and breaking the realistic rate-distance limit of continuous variable quantum key distribution

Abstract

In this work, the rate-distance limit of continuous variable quantum key distribution is studied. We find that the excess noise generated on Bob's side and the method for calculating the excess noise restrict the rate-distance limit. Then, a realistic rate-distance limit is found. To break the realistic limit, a method for calculating the secret key rate using pure excess noise is proposed. The improvement in the rate-distance limit due to a higher reconciliation efficiency is analyzed. It is found that this improvement is dependent on the excess noise. From a finite-size analysis, the monotonicity of the Holevo bound versus the transmission efficiency is studied, and a tighter rate-distance limit is presented.

arXiv comment5 pages,5 figures

References in corpus (27)

• The Security of Practical Quantum Key Distribution
• Gaussian Quantum Information
• Continuous variable quantum cryptography using coherent states
• Quantum key distribution using gaussian-modulated coherent states
• General Benchmarks for Quantum Repeaters
• Fundamental Limits of Repeaterless Quantum Communications
• Overcoming the rate-distance barrier of quantum key distribution without using quantum repeaters
• Experimental demonstration of long-distance continuous-variable quantum key distribution
• Continuous variable quantum cryptography
• Unconditional optimality of Gaussian attacks against continuous-variable QKD
• Quantum key distribution over 25 km with an all-fiber continuous-variable system
• Quantum Cryptography without Switching
• Finite-size analysis of continuous-variable quantum key distribution
• Quantum Distribution of Gaussian Keys with Squeezed States
• Fast and simple one-way Quantum Key Distribution
• Secure quantum key distribution using squeezed states
• Analysis of Imperfections in Practical Continuous-Variable Quantum Key Distribution
• Coexistence of continuous variable QKD with intense DWDM classical channels
• Field test of a continuous-variable quantum key distribution prototype
• Continuous-variable quantum key distribution protocols with a non-Gaussian modulation
• Quantum key distribution with bright entangled beams
• Key Reconciliation with Low-Density Parity-Check Codes for Long-Distance Quantum Cryptography
• Field Test of Classical Symmetric Encryption with Continuous Variable Quantum Key Distribution
• Unidimensional continuous-variable quantum key distribution
• Controlling excess noise in fiber optics continuous variables quantum key distribution
• Finite size analysis of measurement device independent quantum cryptography with continuous variables
• Finite-size analysis of continuous-variable measurement-device-independent quantum key distribution

Cited by in corpus (8)

• Continuous-variable quantum key distribution system: past, present, and future
• Continuous-Variable Quantum Key Distribution with Rateless Reconciliation Protocol
• Asymptotic security of discrete-modulation protocols for continuous-variable quantum key distribution
• Feasibility Assessment For Practical Continuous Variable Quantum Key Distribution Over The Satellite-to-Earth Channel
• Discrete-modulation continuous-variable quantum key distribution with high key rate
• Comparison of Discrete Variable and Continuous Variable Quantum Key Distribution Protocols with Phase Noise in the Thermal-Loss Channel
• Silicon photonics-integrated time-domain balanced homodyne detector in continuous-variable quantum key distribution
• Performance analysis of continuous-variable quantum key distribution using non-Gaussian states