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Let's assume we already colonised Alpha Centauri.

What kind of technology we need in order to send and receive 1kbps?

Radio satellite orbiting the sun? How much power, antenna size and solar panel size? What frequency?

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How powerful an antenna needs to be to signal Earth from other solar systems?

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    $\begingroup$ These are different questions, but related: Breakthrough Starshot's 100 Gigawatt laser array - what's the current thinking how this might work? and How are the tiny spacecraft proposed by Project Starshot supposed to communicate with Earth? $\endgroup$ – uhoh Nov 23 '20 at 22:04
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    $\begingroup$ If we already got the technology to colonise Alpha Centauri, we have the technology needed for communication. Colonisation flights would be impossible without it. $\endgroup$ – Uwe Nov 23 '20 at 23:59
  • $\begingroup$ Ok then assume AC has a civilisation advanced at the same level with us $\endgroup$ – Joe Jobs Nov 24 '20 at 0:18
  • $\begingroup$ It is ok to wait 4 years to download a lot of useful data like their best technology. The question still remains - what kind of technology we have to use to transmit and receive such data $\endgroup$ – Joe Jobs Nov 25 '20 at 16:00
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    $\begingroup$ @uhoh You are right. So far no one proved in practice that superluminal communication is possible. I will delete comment. Just in case I don't turn out to muddy the water, I will list one source iopscience.iop.org/article/10.1088/1742-6596/1275/1/012035/pdf where from the abstract itself it can be seen that there are physicists who assume that superluminal communication can still be achieved. From the reference list of that source one can find the works of these physicists. $\endgroup$ – WOW 6EQUJ5 Nov 27 '20 at 9:31

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