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Path: ...!eternal-september.org!feeder2.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: For the smart guys/girls/what-have-you here: "Towards a European
 quantum internet"
Date: Fri, 1 Nov 2024 23:59:41 +1100
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On 1/11/2024 7:24 pm, Carlos E.R. wrote:
> 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
>>>
>>> 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?
>>
>> 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.

The optical fibre gets one of the two entangled photons to the remote 
location where it's state gets inspected.

-- 
Bill Sloman, Sydney