Comment on Oxford scientists achieve teleportation with quantum supercomputer
knightly@pawb.social 3 days agoThe optics are just the medium through which the qubits are entangled, the interesting part isn’t the lasers but the interaction between physically-separated qubits.
You could theoretically accomplish the same thing by physically bonking the qubits together so that they interact via nuclear forces instead of the electromagnetic field, like they did with entire molecules at Durham University a few weeks back: www.msn.com/en-us/news/technology/…/ar-AA1xfHI9
ReanuKeeves@lemm.ee 3 days ago
Well you can’t say it’s teleportation without transmitting data but also say they use fiber optics as a medium. This is about as much teleportation as my fiber optic internet connection.
knightly@pawb.social 3 days ago
It is teleportation, but the thing being teleported is information about a quantum state.
The particles that carry this information are in a quantum superposition, like Shrodinger’s Cat. Because of quantum physics, the information they carry doesn’t exist until you open the box and measure it.
ReanuKeeves@lemm.ee 3 days ago
In this context, the article describes quantum teleportation as “teleport information so that it never physically travels across the connection”
So why would we need a physical medium like fiber optics? Do they not use that to transfer the information between qubits? Because that’s what it’s reading as. I understand the superposition of qubits but why is that relevant when at the end of they day, they are transfering information through a medium? In quantum entanglement you wouldn’t need any medium so it’s technically a form of teleportation. I don’t see how optics transferring information whether it’s superpositioned or not would be the same.
knightly@pawb.social 3 days ago
As confusing as it seems, they’re correct. A physical medium is still necessary to enable the two parties to interact with each other, but the information that travels through it doesn’t exist until it is received.
The photons that carry the information are Shrodinger’s Cat, both alive and dead until the box is opened. It’s impossible to know one way or another without checking, so the information about the contents of the box doesn’t physically exist until then.
This has been proven via the double-slit experiment. Shining a beam of light at a card with two slits in it causes the resulting shadow to show a diffraction pattern. This is caused by the photons interacting with themselves as they pass through both slits simultaneously. However, if you put a photon detector in front of one slit to try and measure which slit the photon passes through, the diffraction pattern dissapears because the act of measuring it collapses the quantum uncertainty and prevents the photon from passing through both slits and interacting with itself.