Entanglement Generation via Non-Gaussian Transfer over Atmospheric Fading Channels

Abstract

In this work we probe the usefulness of non-Gaussian entangled states as a resource for quantum communication through atmospheric channels. We outline the initial conditions in which non-Gaussian state transfer leads to enhanced entanglement transfer relative to that obtainable via Gaussian state transfer. However, we conclude that in (anticipated) operational scenarios - where most of the non-Gaussian states to be transferred over the air are created just-in-time via photonic subtraction, addition or replacement from incoming Gaussian states - the entanglement-generation rate between stations via non-Gaussian state transfer will be substantially less than that created by direct Gaussian state transfer. The role of post-selection, distillation and quantum memory in altering this conclusion is discussed, and comparison with entanglement rates produced via single-photon technologies is provided. Our results suggest that in the near term entangled Gaussian states, squeezed beyond some modest level, offer the most attractive proposition for the distribution of entanglement through high-loss atmospheric channels. The implications of our results for entanglement-based QKD to low-earth orbit are presented.

12 pages, 8 figures

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• Probing free-space quantum channels with laboratory-based experiments
• Continuous-variable entanglement distillation by cascaded photon replacement
• CV-QKD with Gaussian and non-Gaussian Entangled States over Satellite-based Channels
• Simple and loss-tolerant free-space QKD using a squeezed laser
• Numerical simulations of atmospheric quantum channels
• Quantum Entanglement Distribution in Next-Generation Wireless Communication Systems
• Global Entanglement Distribution with Multi-mode Non-Gaussian Operations
• CV-MDI Quantum Key Distribution via Satellite
• Quantum Communications via Satellite with Photon Subtraction
• Cat-state-like non-Gaussian entanglement in magnon systems
• Nonclassicality and Bell nonlocality in atmospheric links
• Circular-beam approximation for quantum channels in a turbulent atmosphere