Quantum teleportation between photons from two distant light sources achieved

Comments

• peopleproblems@lemmy.world ⁨5⁩ ⁨weeks⁩ ago

  This is a big breakthrough. If they can do it at 10m then the scale is unlimited.

  It essentially should circumvent MITM attacks.

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  • tias@discuss.tchncs.de ⁨5⁩ ⁨weeks⁩ ago

    Yeah my IT department won’t see that as a feature. They want to be the man in the middle.

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• SaveTheTuaHawk@lemmy.ca ⁨5⁩ ⁨weeks⁩ ago

  This is the scientific term teleportation, not the Sci-fi bullshit.

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• frezik@lemmy.blahaj.zone ⁨5⁩ ⁨weeks⁩ ago

  Quantum encryption will be “broken” the same way as conventional crypto is: side channels. It’s nice to have, but it doesn’t solve the most common attacks.

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• RepleteLocum@lemmy.blahaj.zone ⁨5⁩ ⁨weeks⁩ ago

  I don’t get it. From my understanding it sounds like they measure (but not actually because that would affect the photon) and produce a copy of it at another point with it still being unknown. The „measuring“ is something something calculations, but how do they transfer information to create that photon again?

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  • DoPeopleLookHere@sh.itjust.works ⁨5⁩ ⁨weeks⁩ ago

    Disclaimer: it’s been a decade since I did my undergrad in physics.

    Its called entanglement. Meaning two things are quantum linked to be the same state. In this case the dots. This is done without any physical link between them. That’s what makes this teleportation.

    So what happens is both sides are in a quantum state where each dot is both 0 and 1. But importantly when measured they will produce the same result. The other effect is what you do to one dot, you do to both.

    This is where I get fuzzy.

    The idea here is to have one dot in the computer and one dot to observe outside. You do the physics in the computer to compute the result, then observe the dot outside to see the result.

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