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.
