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

On 2024-11-01 07:41, Bill Sloman wrote:

On 1/11/2024 4:56 pm, 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
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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.
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Paper:
  https://www.science.org/doi/10.1126/sciadv.adp6442
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Me:
I wonder, yes I wonder...
Not sure I understand it, not sure what it could do..
Anybody has a simple explanation?
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quantum??? has become some sort of sales word...
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ESP simpler?

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The key phrase is "entangled photons". It's secure because only two photons can be entangled. It's hard to exploit because photons don't seem to stay entangled for long. People have been working on it for years.

 If photons at a distance are entangled, what is the optical fibre needed for? I must be missing something.