Continuous-Variable Measurement-Device-Independent Quantum Key Distribution in Free-Space Channels

Abstract

The field of space communications is the realm of communication technologies where diffraction and atmospheric effects, both of which contribute to loss and noise, become overriding. The pertinent questions here are how and at which rate information (secret keys) can be securely transferred (shared) among users under such supposedly severe circumstances. In the present work we study continuous-variable (CV) quantum key distribution (QKD) in a measurement-device-independent (MDI) configuration over free-space optical (FSO) links. We assess the turbulence regime and provide a composable finite-size key rate analysis of the protocol for FSO links. We study both short-range, horizontal communication links as well as slant paths to, e.g., high-altitude platform station (HAPS) systems.

9 pages, 6 figures

References in corpus (7)

• The Quantum Internet
• Satellite-to-ground quantum key distribution
• Ground-to-satellite quantum teleportation
• Entanglement of Gaussian states and the applicability to quantum key distribution over fading channels
• Composable security for continuous variable quantum key distribution: Trust levels and practical key rates in wired and wireless networks
• Finite size analysis of measurement device independent quantum cryptography with continuous variables
• Applicability of Squeezed-and Coherent-State Continuous-Variable Quantum Key Distribution over Satellite Links

Cited by in corpus (7)

• Continuous-variable quantum key distribution system: past, present, and future
• Continuous-variable quantum communication
• Advances in Continuous Variable Measurement-Device-Independent Quantum Key Distribution
• Intermodal quantum key distribution field trial with active switching between fiber and free-space channels
• The future of secure communications: device independence in quantum key distribution
• An Overview of CV-MDI-QKD
• An introductory review of the theory of continuous-variable quantum key distribution: Fundamentals, protocols, and security