IIUC, quantum entanglement at a distance provides for faster than light/instant communication of state changes. High frequency trading, and dark orderbooks, is the only known economic application (space communications a far off application). I'm not sure why article avoided talking about this purpose.

[–] SpacetimeMachine@lemmy.world 16 points 2 months ago

You don't understand correctly. Entangled particles do not allow for faster than light communication.

[–] smeenz@lemmy.nz 7 points 2 months ago* (last edited 2 months ago) (2 children)

While the entangled photons may be thought of as changing state simultaneously, in practice, it's not possible to use this to convey information, as doing so would break causality, and effect would be able to happen before its cause. Remember that what is commonly termed 'the speed of light' is actually better expressed as 'the speed of causality'. The most useful application of what this experiment performed would be in the area of quantum cryptography.

[–] Bear_pile@lemm.ee 2 points 2 months ago (1 children)

So honest question here:

Why can't it be used to transmit information? Wouldn't we be able to capture the state and use that be turned into instructions the same way we use binary currently?

Binary is essentially just a series of "on" and "off" states that we capture and translate into instructions, so why can't we do that with entangled particles? Like position 6 translates into instructions F and position 2 triggers instructions B.

I know this is overly simplified but I do not follow that we can't send information this way when looking at it through this lense.

[–] smeenz@lemmy.nz 2 points 2 months ago* (last edited 2 months ago)

Watch these videos that explain the answer. Basically, the problem is that you can only use this to convey random information , which would be indistinguishable from not sending anything at all.

https://youtu.be/0xI2oNEc1Sw

https://youtu.be/BLqk7uaENAY

[–] peteyestee@feddit.org 1 points 2 months ago* (last edited 2 months ago)

So you're telling me my Bitcoin is quantum now?

[–] xor@lemmy.dbzer0.com 3 points 2 months ago

it doesn’t work like that

[–] itslilith@lemmy.blahaj.zone 2 points 2 months ago

that's not how that works, quantum entanglement can not be used to transmit information and thus doesn't violate causality