Advances in Space Quantum Communications
Jasminder S. Sidhu, Siddarth K. Joshi, Mustafa Gundogan, Thomas, Brougham, David Lowndes, Luca Mazzarella, Markus Krutzik, Sonali Mohapatra,, Daniele Dequal, Giuseppe Vallone, Paolo Villoresi, Alexander Ling, Thomas, Jennewein, Makan Mohageg, John Rarity, Ivette Fuentes

TL;DR
This paper reviews recent advances and future prospects of space-based quantum communication technologies, emphasizing small satellite missions, key challenges, and the potential for a global quantum internet.
Contribution
It provides a comprehensive overview of current space quantum communication efforts, including recent demonstrations, challenges, and a roadmap for future development of a global quantum network.
Findings
Quantum networks are already implemented in several metropolitan areas.
Recent space-based quantum cryptography demonstrations show promising progress.
Small satellites are increasingly important for cost-effective global coverage.
Abstract
Concerted efforts are underway to establish an infrastructure for a global quantum internet to realise a spectrum of quantum technologies. This will enable more precise sensors, secure communications, and faster data processing. Quantum communications are a front-runner with quantum networks already implemented in several metropolitan areas. A number of recent proposals have modelled the use of space segments to overcome range limitations of purely terrestrial networks. Rapid progress in the design of quantum devices have enabled their deployment in space for in-orbit demonstrations. We review developments in this emerging area of space-based quantum technologies and provide a roadmap of key milestones towards a complete, global quantum networked landscape. Small satellites hold increasing promise to provide a cost effective coverage required to realised the quantum internet. We review…
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