Discrete-modulation continuous-variable quantum key distribution with high key rate

Abstract

Discrete-modulation continuous-variable quantum key distribution has the potential for large-scale deployment in the secure quantum communication networks due to low implementation complexity and compatibility with the current telecom systems. The security proof for four coherent states phase-shift keying (4-PSK) protocol has recently been established by applying numerical methods. However, the achievable key rate is relatively low compared with the optimal Gaussian modulation scheme. To enhance the key rate of discrete-modulation protocol, we first show that 8-PSK increases the key rate by about 60\% in comparison to 4-PSK, whereas the key rate has no significant improvement from 8-PSK to 12-PSK. We then expand the 12-PSK to two-ring constellation structure with four states in the inner ring and eight states in the outer ring, which significantly improves the key rate to be 2.4 times of that of 4-PSK. The key rate of the two-ring constellation structure can reach 70\% of the key rate achieved by Gaussian modulation in long distance transmissions, making this protocol an attractive alternative for high-rate and low-cost application in secure quantum communication networks.

Welcome comments

References in corpus (17)

• Unconditional optimality of Gaussian attacks against continuous-variable QKD
• Quantum key distribution over 25 km with an all-fiber continuous-variable system
• Optimality of Gaussian Attacks in Continuous Variable Quantum Cryptography
• Finite-size analysis of continuous-variable quantum key distribution
• Continuous Variable Quantum Cryptography using Two-Way Quantum Communication
• Experimental study on Gaussian-modulated coherent states quantum key distribution over standard telecom fiber
• Practical continuous-variable quantum key distribution with composable security
• Satellite Quantum Communications: Fundamental Bounds and Practical Security
• Explicit asymptotic secret key rate of continuous-variable quantum key distribution with an arbitrary modulation
• Asymptotic security of continuous-variable quantum key distribution with a discrete modulation
• Measurement-Based Noiseless Linear Amplification for Quantum Communication
• Security of Binary Modulated Continuous Variable Quantum Key Distribution under Collective Attacks
• Composable security for continuous variable quantum key distribution: Trust levels and practical key rates in wired and wireless networks
• Experimental Demonstration of High-Rate Discrete-Modulated Continuous-Variable Quantum Key Distribution System
• Tight Secure Key Rates for CV-QKD with 8PSK Modulation
• Optimizing Continuous-Variable Quantum Key Distribution with Phase-Shift Keying Modulation and Postselection
• Numerical Method for Finite-size Security Analysis of Quantum Key Distribution

Cited by in corpus (6)

• Continuous-variable quantum key distribution system: past, present, and future
• Experimental Demonstration of Sequential Multiparty Quantum Secret Sharing and Quantum Conference Key Agreement
• Experimental Demonstration of Discrete Modulation Formats for Continuous Variable Quantum Key Distribution
• Continuous-variable quantum communication
• Advances in Continuous Variable Measurement-Device-Independent Quantum Key Distribution
• Continuous-variable quantum key distribution over 50.4 km fiber using integrated silicon photonic transmitter and receiver