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Physics World

Aliens could use quantum signals to communicate with Earth

Martijn Boerkamp

Published Sep 1, 2022• 0 citations
Publisher

Abstract

Quantum signals could be a viable means of establishing contact across interstellar distances, according to researchers at the University of Edinburgh.
DOI
10.1088/2058-7058/35/08/06

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The possibility of achieving quantum communication using photons across interstellar distances is examined. For this, different factors are considered that could induce decoherence of photons, including the gravitational field of astrophysical bodies, the particle content in the interstellar medium, and the more local environment of the Solar System. The x-ray region of the spectrum is identified as the prime candidate to establish a quantum communication channel, although the optical and microwave bands could also enable communication across large distances. Finally, we discuss what could be expected from a quantum signal emitted by an extraterrestrial civilization, as well as the challenges for the receiver end of the channel to identify and interpret such signals.