Advances in Space Quantum Communications

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  • 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
  • Stefano Pirandola
  • Daniel K. L. Oi


Publication details

Journal IET Quantum Communication
DateAccepted/In press - 14 Jun 2021
DatePublished (current) - 19 Jul 2021
Original languageEnglish


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 the state of art in small satellite missions and collate the most current in-field demonstrations of quantum cryptography. We summarise important challenges in space quantum technologies that must be overcome and recent efforts to mitigate their effects. A perspective on future developments that would improve the performance of space quantum communications is included. We conclude with a discussion on fundamental physics experiments that could take advantage of a global, space-based quantum network.

Bibliographical note

© 2021, The Author(s)
26 pages, 9 figures. Comments welcome. This paper is a preprint of a paper submitted to IET Quantum Communication. If accepted, the copy of record will be available at the IET Digital Library

    Research areas

  • quant-ph

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