(SpaceWatch) Project Q’s Gabriella Skoff provides a comprehensive review about the challenges and opportunities of a satellite-based quantum internet. New satellite constellations are being presented as the best way forward to empower a global quantum internet. As the use-value of satellites broadens and we become ever-more dependent on the networks and systems they support, two critical threats loom large. One, the physical threat of space debris; and two, the threat posed by the increasing militarization of space. These challenges to the implementation of a space-based quantum internet have not yet surfaced in the developing debate but must be addressed as we stand on the brink of the quantum age.
New research conducted by a Louisiana State University team led by Sumeet Khatri suggests that satellite-based technology is the best way forward to build a global quantum internet. According to the researchers, a quantum-enabled satellite constellation would be the most cost-effective approach to realise the next big application in quantum communications. Khatri’s team suggests that the most effective and logistically coherent system for a space-based quantum internet would require a constellation of at least 400 satellites, circling the globe in mid-Earth orbit, at an altitude of around 3,000 kilometres.
Space itself is no sanctuary from geopolitical rivalries. The implementation of a space-based global quantum internet will present a challenge for the grey area of international space development. Quantum satellites straddle the fine line between non-militarised and militarised infrastructure.

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