[yorwba]

"Quantum communication" still uses a conventional communication channel to exchange data, it's only the encryption key that is determined by exchanging single quanta. That's because single quanta are very susceptible to noise, which is very useful to detect eavesdropping but undesirable when you want to exchange large amounts of data.

To reliably send a signal across large distances, it's much better to use a bright light source focused at the target. When you start with trillions of photons, it doesn't harm the signal quality very much if a few of them hit interstellar dust on the way.

[dannyw]

Your message is accurate, but I think you're missing the forest for the trees.

It's like looking for telegraphy systems when everyone else are using radio waves.

[yorwba]

If you have no idea that radio waves exist and no way to build a receiver, looking for telegraph lines is the best you can do. Given our (or rather my) knowledge of physics and engineering, electromagnetic waves are the best medium for long-distance communication and quantum magic isn't going to change that anytime soon. If there really is something that's even better, we can start worrying about it once we can detect it.