Feasibility of Quantum Key Distribution from High Altitude Platforms

Yi Chu, Ross Donaldson, Rupesh Kumar, David Grace

Research output: Working paperPreprint


This paper presents the feasibility study of deploying Quantum Key Distribution (QKD) from High Altitude Platforms (HAPs), as a way of securing future communications applications and services. The paper provides a thorough review of the state of the art HAP technologies and summarises the benefits that HAPs can bring to the QKD services. A detailed link budget analysis is presented in the paper to evaluate the feasibility of delivering QKD from stratospheric HAPs flying at 20 km altitude. The results show a generous link budget under most operating conditions which brings the possibility of using diverged beams, thereby simplifying the Pointing, Acquisition and Tracking (PAT) of the optical system on the HAPs and ground, potentially widening the range of future use cases where QKD could be a viable solution.
Original languageUndefined/Unknown
Number of pages12
Publication statusPublished - 14 Dec 2020

Publication series


Bibliographical note

12 pages, 11 figures. Comments are welcome


  • quant-ph

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