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.

arXiv commentWelcome comments

References in corpus (58)

• Quantum Cryptography
• Quantum information with continuous variables
• The Security of Practical Quantum Key Distribution
• Gaussian Quantum Information
• Advances in Quantum Cryptography
• Unconditional Security Of Quantum Key Distribution Over Arbitrarily Long Distances
• Secure quantum key distribution with realistic devices
• Continuous variable quantum cryptography using coherent states
• Quantum key distribution using gaussian-modulated coherent states
• Fundamental Limits of Repeaterless Quantum Communications
• General Benchmarks for 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
• Optimality of Gaussian Attacks in Continuous Variable Quantum Cryptography
• High-rate quantum cryptography in untrusted networks
• Finite-size analysis of continuous-variable quantum key distribution
• Long-Distance Continuous-Variable Quantum Key Distribution over 202.81 km of Fiber
• Unconditional security proof of long-distance continuous-variable quantum key distribution with discrete modulation
• Continuous-Variable Quantum Key Distribution with Gaussian Modulation -- The Theory of Practical Implementations
• Distributing Secret Keys with Quantum Continuous Variables: Principle, Security and Implementations
• Continuous Variable Quantum Cryptography using Two-Way Quantum Communication
• Security of continuous-variable quantum key distribution via a Gaussian de Finetti reduction
• Continuous variable quantum key distribution with two-mode squeezed states
• No-Switching Quantum Key Distribution using Broadband Modulated Coherent Light
• Experimental study on Gaussian-modulated coherent states quantum key distribution over standard telecom fiber
• Experimental demonstration of Gaussian protocols for one-sided device-independent quantum key distribution
• Continuous-variable QKD over 50km commercial fiber
• Continuous-variable quantum key distribution protocols with a non-Gaussian modulation
• Numerical approach for unstructured quantum key distribution
• Practical continuous-variable quantum key distribution with composable security
• Satellite Quantum Communications: Fundamental Bounds and Practical Security
• Reliable numerical key rates for quantum key distribution
• Asymptotic security analysis of discrete-modulated continuous-variable quantum key distribution
• 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
• Feasibility of satellite-to-ground continuous-variable quantum key distribution
• Unidimensional continuous-variable quantum key distribution
• 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
• Coherent State Quantum Key Distribution with Multi Letter Phase-Shift Keying
• Experimental Demonstration of High-Rate Discrete-Modulated Continuous-Variable Quantum Key Distribution System
• A simple proof that Gaussian attacks are optimal among collective attacks against continuous-variable quantum key distribution with a Gaussian modulation
• A security proof of continuous-variable QKD using three coherent states
• Numerical Calculations of Finite Key Rate for General Quantum Key Distribution Protocols
• Asymptotic security of discrete-modulation protocols for continuous-variable quantum key distribution
• Continuous-variable quantum cryptography with discrete alphabets: Composable security under collective Gaussian attacks
• Experimental passive state preparation for continuous variable quantum communications
• Trusted detector noise analysis for discrete modulation schemes of continuous-variable quantum key distribution
• Numerical finite-key analysis of quantum key distribution
• Quantum key distribution with phase-encoded coherent states: Asymptotic security analysis in thermal-loss channels
• Tight Secure Key Rates for CV-QKD with 8PSK Modulation
• Optimizing Continuous-Variable Quantum Key Distribution with Phase-Shift Keying Modulation and Postselection
• Finding and breaking the realistic rate-distance limit of continuous variable quantum key distribution
• Exploring and Experimenting with Shaping Designs for Next-Generation Optical Communications
• 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