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Comment on Quantum teleportation demonstrated over existing fiber networks — Deutsche Telekom’s T‑Labs used commercially available Qunnect hardware for the demo, claims 90% average accuracy

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ParlimentOfDoom@piefed.zip ⁨10⁩ ⁨hours⁩ ago

Theoretically, zero latency. If you don’t have to wait for a photon to get all the way from one end of a line to another, that can improve a lot of things.

I’m not sure what the fiber is doing here, but if they can get it working without that, they could drive rovers around Mars in real time, instead of waiting the 4-24 minute delay each way when sending/receiving signals.

Or streaming video games could be actually playable instead of frustrating messes.

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HubertManne@piefed.social ⁨10⁩ ⁨hours⁩ ago
Have we ever actually proved it can exceed the speed of light in information travel? I swear I have seen stuff where its theorized the speed of light is also the speed of causality

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- MatSeFi@lemmy.liebeleu.de ⁨9⁩ ⁨hours⁩ ago
  Nope, the actual information must still be transported via a classical no quantum (and trusted) channel so that both ends can match their statistics and thus deduce the crytographic keys from the qunatum signals. And thats it what its all about: key exchange
  
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  - HubertManne@piefed.social ⁨7⁩ ⁨hours⁩ ago
    thanks. I had forgotten about that I think mainly because I can’t wrap my mind around how it works like if its intercepted and used then it will confirm that its void and produce a new one or such.
    
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- mech@feddit.org ⁨10⁩ ⁨hours⁩ ago
  Yes. If you could transport information faster than the speed of light, it’s easy to find examples that break causality, where an observer sees a message arrive before he sees it being sent.
  
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  - ParlimentOfDoom@piefed.zip ⁨9⁩ ⁨hours⁩ ago
    It’s argue that that would be breaking our ability to properly interpret causality, not that causality itself breaks. Things still occur in the order they happen regardless of what order we see them happen from different perspectives.
    
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    mech@feddit.org ⁨9⁩ ⁨hours⁩ ago
    No, not if the observer can see the message arrive first, and immediately send a faster than light signal to the sender that turns off their transmitter, preventing the sending of their message.
    
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frongt@lemmy.zip ⁨6⁩ ⁨hours⁩ ago
Not just latency, but any connection at all. Somewhere there’s no signal, like in a submarine.

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