Interstellar Quantum Links: Coherence, Wavelength Thresholds, and the Practical Barrier to Galactic Communication

To the point

Latham Boyle and Berera show that interstellar quantum communication could be possible in principle, but it would require nonzero quantum capacity and enormous receiver apertures—about a 100-kilometer diameter for Proxima Centauri—making practical one-way quantum links across the galaxy effectively impossible and offering a possible explanation for the Fermi paradox.

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On Interstellar Quantum Communication And The Fermi Paradox - Astrobiology
astrobiology.com

On Interstellar Quantum Communication And The Fermi Paradox - Astrobiology

Since it began Cocconi Morrison, the search for extraterrestrial intelligence (SETI) has focused on interstellar classical communication. Recently, Berera:2020rpl pointed out that, at certain frequencies, photon qubits can retain their quantum coherence over interstellar (and even intergalactic) distances, raising the prospect of interstellar quantum communication. This is an intriguing possibility, since quantum communication permits certain […]