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A hybrid architecture combining low Earth orbit satellites with stratospheric high-altitude platforms achieves a nearly two-order-of-magnitude improvement in secure key generation rates for transatlantic quantum networks. By eliminating the need for unproven quantum memories or repeaters, this approach offers a scalable pathway to long-range quantum communication that overcomes the range limitations inherent in fiber and free-space optical links. This advancement marks a significant step toward practical, complex-free global quantum infrastructure without relying on currently infeasible technologies.

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Satellites and High-Altitude Platforms Boost Quantum Entanglement over 6,500km

Quantum ZeitgeistJune 9, 20265 min read

A transatlantic quantum network distributing nearly two orders of magnitude more secure key bits per year is now within reach, thanks to a novel architecture. This system utilises a low Earth orbit satellite alongside stratospheric relays, eclipsing the performance of single medium Earth orbit satellite approaches. The configuration reduces complexity, offering a pathway to scalable long-range quantum communication without relying on unproven technologies.

A new architecture utilising low Earth orbit satellites and stratospheric high altitude platforms enables transatlantic quantum entanglement distribution over 6,500km. Kimia Mohammadi of University of Waterloo and colleagues present a system that maximises entanglement distribution rates without requiring quantum memories or repeaters. The findings reveal this configuration can achieve approximately 5×10^6 secure key bits per year with 30cm ground receivers, a sharp improvement, nearly two orders of magnitude higher, compared to single medium Earth orbit satellite systems. This configuration highlights the potential of hybrid satellite-HAP networks to reduce complexity and enable scalable,…

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