Re: For the smart guys/girls/what-have-you here: "Towards a European quantum internet"

On 11/1/24 06:56, Jan Panteltje wrote:

A rudimentary quantum network link between Dutch cities
Stepping out of the lab, into the real world, towards a European quantum internet
  https://www.sciencedaily.com/releases/2024/10/241030145638.htm
 Source:
     Delft University of Technology
Summary:
  Researchers have demonstrated a network connection between quantum processors over metropolitan distances.
  Their result marks a key advance from early research networks in the lab towards a future quantum internet.
  The team developed fully independently operating nodes and integrated these with deployed optical internet fiber, enabling a 25-km quantum link.
 Paper:
  https://www.science.org/doi/10.1126/sciadv.adp6442
 Me:
I wonder, yes I wonder...
Not sure I understand it, not sure what it could do..
Anybody has a simple explanation?
 quantum??? has become some sort of sales word...
 ESP simpler?

All this talk of quantum entanglement just serves to confuse
investors and public money grantors. The more confused the
stories, the more money they get.
'Quantum' just means that interactions between waves and matter
can only occur in fixed-size chunks. There are plenty of
macroscopic examples of that, so it shouldn't come as too much
of a surprise.
'Entanglement' means that if you execute the same measurement
in two places of wave phenomena with the same origin, the
results are correlated. Again, that's what you'd expect.
Entanglement is kind of hard to do in the optical domain if
the setup extends over kilometers and quantum-limited signal
detection is kind of hard at frequencies much below optical,
I'll grant them that.
Jeroen Belleman