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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 Organization: A noiseless patient Spider Lines: 45 Message-ID: <vg2jca$38ej2$1@dont-email.me> References: <vg1qja$lve$1@solani.org> <vg1t78$34qqo$1@dont-email.me> <crfevkx7hu.ln2@Telcontar.valinor> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Fri, 01 Nov 2024 13:59:54 +0100 (CET) Injection-Info: dont-email.me; posting-host="e775363915d34fba105a85731db38d5f"; logging-data="3422818"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX186VLZZH05PZJiIUS+SJ0qgsxaWBgLmy20=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:BYV/k9W2FdQsNSZsNVXUWZVSfVE= Content-Language: en-US X-Antivirus: Norton (VPS 241101-2, 1/11/2024), Outbound message In-Reply-To: <crfevkx7hu.ln2@Telcontar.valinor> X-Antivirus-Status: Clean Bytes: 2849 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