Everyday life on the internet is insecure. Hackers can break into bank accounts or steal digital identities. Driven by AI, attacks are becoming increasingly sophisticated. Quantum cryptography promises more effective protection. It makes communication secure against eavesdropping by relying on the laws of quantum physics. However, the path toward a quantum internet is still fraught with technical hurdles.
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?
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.