Fading channel estimation for free-space continuous-variable secure quantum communication

Abstract

We investigate estimation of fluctuating channels and its effect on security of continuous-variable quantum key distribution. We propose a novel estimation scheme which is based on the clusterization of the estimated transmittance data. We show that uncertainty about whether the transmittance is fixed or not results in a lower key rate. However, if the total number of measurements is large, one can obtain using our method a key rate similar to the non-fluctuating channel even for highly fluctuating channels. We also verify our theoretical assumptions using experimental data from an atmospheric quantum channel. Our method is therefore promising for secure quantum communication over strongly fluctuating turbulent atmospheric channels.

17 pages, 11 figures

References in corpus (36)

• Quantum Cryptography
• Quantum information with continuous variables
• The Security of Practical Quantum Key Distribution
• Gaussian Quantum Information
• Satellite-to-ground quantum key distribution
• Continuous variable quantum cryptography using coherent states
• Quantum key distribution using gaussian-modulated coherent states
• Experimental demonstration of long-distance continuous-variable quantum key distribution
• Practical challenges in quantum key distribution
• Unconditional optimality of Gaussian attacks against continuous-variable QKD
• Optimality of Gaussian Attacks in Continuous Variable Quantum Cryptography
• Finite-size analysis of continuous-variable quantum key distribution
• Progress in satellite quantum key distribution
• Quantum Distribution of Gaussian Keys with Squeezed States
• Distributing Secret Keys with Quantum Continuous Variables: Principle, Security and Implementations
• Security of continuous-variable quantum key distribution against general attacks
• Continuous variable quantum key distribution with two-mode squeezed states
• Characterization of Collective Gaussian Attacks and Security of Coherent-State Quantum Cryptography
• Generating the local oscillator "locally" in continuous-variable quantum key distribution based on coherent detection
• Toward Global Quantum Communication: Beam Wandering Preserves Nonclassicality
• Atmospheric Quantum Channels with Weak and Strong Turbulence
• Entanglement of Gaussian states and the applicability to quantum key distribution over fading channels
• Trusted Noise in Continuous-Variable Quantum Key Distribution: a Threat and a Defense
• Atmospheric continuous-variable quantum communication
• Atmospheric effects on continuous-variable quantum key distribution
• Long-distance continuous-variable quantum key distribution with efficient channel estimation
• Testing Quantum Devices: Practical Entanglement Verification in Bipartite Optical Systems
• Finite size analysis of measurement device independent quantum cryptography with continuous variables
• Entanglement verification for quantum key distribution systems with an underlying bipartite qubit-mode structure
• Continuous-variable quantum key distribution in fast fading channels
• Squeezing-enhanced quantum key distribution over atmospheric channels
• Free-space continuous-variable quantum key distribution of unidimensional Gaussian modulation using polarized coherent-states in urban environment
• Polarization attack on continuous-variable quantum key distribution
• Stabilization of transmittance fluctuations caused by beam wandering in continuous-variable quantum communication over free-space atmospheric channels
• Improving parameter estimation of entropic uncertainty relation in continuous-variable quantum key distribution
• Estimation of Output Channel Noise for Continuous Variable Quantum Key Distribution

Cited by in corpus (25)

• Advances in Space Quantum Communications
• Limits and Security of Free-Space Quantum Communications
• Satellite Quantum Communications: Fundamental Bounds and Practical Security
• Feasibility of satellite-to-ground continuous-variable quantum key distribution
• Composable security for continuous variable quantum key distribution: Trust levels and practical key rates in wired and wireless networks
• Quantum communications in a moderate-to-strong turbulent space
• Squeezing-enhanced quantum key distribution over atmospheric channels
• Composable finite-size effects in free-space CV-QKD systems
• Feasibility Assessment For Practical Continuous Variable Quantum Key Distribution Over The Satellite-to-Earth Channel
• Analysis of satellite-to-ground quantum key distribution with adaptive optics
• Applicability of Squeezed-and Coherent-State Continuous-Variable Quantum Key Distribution over Satellite Links
• Satellite-Based Quantum Key Distribution in the Presence of Bypass Channels
• Continuous-variable quantum communication
• Simple and loss-tolerant free-space QKD using a squeezed laser
• Mitigation of Channel Tampering Attacks in Continuous-Variable Quantum Key Distribution
• High-Order Continuous-Variable Coherence of Phase-Dependent Squeezed State
• Classical-Quantum Dual Encoding for Laser Communications in Space
• A Survey on Continuous Variable Quantum Key Distribution for Secure Data Transmission: Toward the Future of Secured Quantum-Networks
• Long-distance free-space quantum key distribution with continuous variables
• Quantum secured LiDAR with Gaussian modulated coherent states
• Quantum communications in continuous variable systems
• Coherence dynamics induced by attenuation and amplification Gaussian channels
• Realistic Threat Models for Fiber and Free-Space Continuous-Variable Quantum Key Distribution
• Shaping the $g^{(2)}$ autocorrelation and photon statistics
• Quantum Physics in Space