Interstellar Quantum Signaling: Photon Coherence, X-ray Advantage, and the Prospects for Extraterrestrial Communication

To the point

Arjun Berera and colleagues propose that interstellar communication could use quantum photons, especially X‑rays, because they can carry more information and interact less with interstellar space, though gravity and relativistic effects pose challenges that might be mitigated if the signal origin is known and detectors are space-based, a view echoed by Michael Hippke who calls it plausible but requires space‑based X‑ray observations, and the next step is to determine whether natural sources can produce coherent quantum photon states.