Here's your simple go-to explanation: The quantum internet is a buzzword to extract research money from EU programs. It has no relevance whatsoever for the real internet.
As with all fundamental research: we don't know yet. Let's not be judgemental beforehand.
Think more like web security certificates...
In a real world implementation, you are using this as a key stream, of which interceptions can be detected by certain loss characteristics.
Perhaps we could find a way to transport an entangled photon down some channel?
* You need a direct connection with a limit in length. This means effectively you can't have wifi, mobile internet or anything like that. You also probably can't use it to have a connection between the US and Europe. Calling that a "quantum internet" is... only possible if you have no idea what the term "internet" means.
* You need an existing authenticated channel or be vulnerable to man in the middle attacks. The quantum key distribution schemes always assume this already exists, but never care to explain where they got it from.
Isn't this theoretically unavoidable for all forms of encryption? You need some way of distinguishing your intended communication partner, because the best that any protocol could do is establish a secure link with whoever is on the other end of the line.
Today it could be block chain, yesterday it was telemedicine, etc
And that does not take into account fiber repeaters or microwave links
Not really for communication, and I suspect that if you want it to scale up to 1000km, it’s going to strongly resemble the vacuum chamber I mentioned.
That's because we allow them to trade at such rates and compete on speed.
A mere few decades to half a century ago we have 1/10 to 1/1000 the speed, and trading was going on just fine...
I'd opt for a "turn based" trading system (with a small, but not tiny turn window), to eliminate any transmission speedup advantage from different traders.