Improved composable key rates for CV-QKD

Abstract

Modern security proofs of quantum key distribution (QKD) must take finite-size effects and composable aspects into consideration. This is also the case for continuous-variable (CV) protocols which are based on the transmission and detection of bosonic coherent states. In this paper, we refine and advance the previous theory in this area providing a more rigorous formulation for the composable key rate of a generic CV-QKD protocol. Thanks to these theoretical refinements, our general formulas allow us to prove more optimistic key rates with respect to previous literature.

Discussion added to explain practical QKD implementation in a session of multiple blocks (new Section IV and Figure 3). Minor typos corrected. Improves theory from arXiv:2203.00706, arXiv:2010.04168, and arXiv:1912.11418

References in corpus (34)

• Quantum Cryptography
• Advances in Quantum Cryptography
• Secure quantum key distribution with realistic devices
• 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
• Distance measures to compare real and ideal quantum processes
• Continuous variable quantum cryptography
• Tight Finite-Key Analysis for Quantum Cryptography
• Quantum Cryptography without Switching
• Quantum cryptography with squeezed states
• 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
• Quantum Distribution of Gaussian Keys with Squeezed States
• Composable security proof for continuous-variable quantum key distribution with coherent states
• Leftover Hashing Against Quantum Side Information
• End-to-end capacities of a quantum communication network
• Security of continuous-variable quantum key distribution via a Gaussian de Finetti reduction
• Direct and Reverse Secret-Key Capacities of a Quantum Channel
• Duality Between Smooth Min- and Max-Entropies
• Characterization of Collective Gaussian Attacks and Security of Coherent-State Quantum Cryptography
• Limits and Security of Free-Space Quantum Communications
• Security of Continuous Variable Quantum Cryptography
• Trusted Noise in Continuous-Variable Quantum Key Distribution: a Threat and a Defense
• Unidimensional continuous-variable quantum key distribution
• Composable security for continuous variable quantum key distribution: Trust levels and practical key rates in wired and wireless networks
• Long-distance continuous-variable quantum key distribution with efficient channel estimation
• Finite-size security of continuous-variable quantum key distribution with digital signal processing
• Quantum communications in a moderate-to-strong turbulent space
• Continuous-variable quantum cryptography with discrete alphabets: Composable security under collective Gaussian attacks
• Composably secure data processing for Gaussian-modulated continuous variable quantum key distribution
• Composable end-to-end security of Gaussian quantum networks with untrusted relays

Cited by in corpus (9)

• Continuous-variable quantum key distribution system: past, present, and future
• Continuous-variable quantum communication
• An Overview of CV-MDI-QKD
• An introductory review of the theory of continuous-variable quantum key distribution: Fundamentals, protocols, and security
• Compact Continuous-Variable Quantum Key Distribution System Employing Monolithically Integrated Silicon Photonic Transceiver
• Realistic Threat Models for Fiber and Free-Space Continuous-Variable Quantum Key Distribution
• Continuous-Variable Quantum Key Distribution with Composable Security and Tight Error Correction Bound towards Constrained-Device Implementations
• Noisy dynamics of Gaussian entanglement: a transient bound entangled phase before separability
• Optimizing Epsilon Security Parameters in QKD