CV-QKD with Gaussian and non-Gaussian Entangled States over Satellite-based Channels

Abstract

In this work we investigate the effectiveness of continuous-variable (CV) entangled states, transferred through high-loss atmospheric channels, as a means of viable quantum key distribution (QKD) between terrestrial stations and low-Earth orbit (LEO) satellites. In particular, we investigate the role played by the Gaussian CV states as compared to non-Gaussian states. We find that beam-wandering induced atmospheric losses lead to QKD performance levels that are in general quite different from those found in fixed-attenuation channels. For example, circumstances can be found where no QKD is viable at some fixed loss in fiber but is viable at the same mean loss in fading channels. We also find that, in some circumstances, the QKD relative performance of Gaussian and non-Gaussian states can in atmospheric channels be the reverse of that found in fixed-attenuation channels. These findings show that the nature of the atmospheric channel can have a large impact on the QKD performance. Our results should prove useful for emerging global quantum communications that use LEO satellites as communication relays.

7 pages, 5 figures

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Cited by in corpus (9)

• Advances in Quantum Cryptography
• Satellite-Based Continuous-Variable Quantum Communications: State-of-the-Art and a Predictive Outlook
• Composable finite-size effects in free-space CV-QKD systems
• Applicability of Squeezed-and Coherent-State Continuous-Variable Quantum Key Distribution over Satellite Links
• Inter-satellite Quantum Key Distribution at Terahertz Frequencies
• Simple and loss-tolerant free-space QKD using a squeezed laser
• Multi-mode CV-QKD with Non-Gaussian Operations
• Quantum Entanglement Distribution in Next-Generation Wireless Communication Systems
• Global Entanglement Distribution with Multi-mode Non-Gaussian Operations