[continuations]

> Quantum-Teleported Data Faster Than the Speed of Light

Isn't that a violation of the No-communication theorem?

https://en.wikipedia.org/wiki/No-communication_theorem

[karpierz]

You can't control the data being transmitted. The analogous process in the macro-world is:

I take a red ball and a green ball and put them into identical looking boxes. I hand one to you and send you to Mars. Then I open my box and see a red ball. I instantly know that you have a green ball in your box, even though it would take 20 minutes for light to travel between Mars and Earth.

The difference is that in the quantum world, each ball is in a superposition of red and green. Once I open my box and collapse the superposition to red, your ball is green, and I know information about your ball that we didn't know when we were together (since at the time we were together, the balls were in superposition).

[gus_massa]

> Isn't that a violation of the No-communication theorem?

Exactly. This is just bad journalism.

[anotheryou]

I also wondered if there is some catch like A knows that B knows new information faster than light, but both essentially just observed the same random phenomenon and there was no input from A reaching B.

[akvadrako]

Quantum teleportation requires sending classical bits at normal speeds, so the headline is just wrong.