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