This is the scientific term teleportation, not the Sci-fi bullshit.
this post was submitted on 20 Nov 2025
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This is a big breakthrough. If they can do it at 10m then the scale is unlimited.
It essentially should circumvent MITM attacks.
Yeah my IT department won't see that as a feature. They want to be the man in the middle.
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.
I think my question on all this would be whether this would ultimately cause problems in terms of data integrity.
Currently most amplifiers for digital information are going to capture the information in the light, probably strip off any modulation to get to the raw data. Then re-modulate that using a new emitter.
The advantages of doing this over just amplifying the original light signal are the same reason switches/routers are store and forward (or at least decode to binary and re-modulate). When you decode the data from the modulated signal and then reproduce it, you are removing any noise that was present and reproducing a clean signal again.
If you just amplify light (or electrical) signals "as-is", then you generally add noise every time you do this reducing the SNR a small amount. After enough times the signal will become non-recoverable.
So I guess my question is, does the process also have the same issue of an ultimate limit in how often you can re-transmit the signal without degradation.
The way I interpreted the article, you aren't amplifying the signal but transferring it. Same as store and forward. I think that implies that degradation is not a problem as long as the new photon profile was a match. The real problem is matching the profile which they only managed at 10 meters.
Yep. I also valid concerns. But those seem to be their next steps. I just wondered if there would be degradation. You wouldn't even be able to tell until it reached the destination.
Definitely interesting stuff.
what about "bit rot" (but, y'know, tiny tiny bits)
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.