this post was submitted on 30 Aug 2023
278 points (92.9% liked)
Technology
59323 readers
4666 users here now
This is a most excellent place for technology news and articles.
Our Rules
- Follow the lemmy.world rules.
- Only tech related content.
- Be excellent to each another!
- Mod approved content bots can post up to 10 articles per day.
- Threads asking for personal tech support may be deleted.
- Politics threads may be removed.
- No memes allowed as posts, OK to post as comments.
- Only approved bots from the list below, to ask if your bot can be added please contact us.
- Check for duplicates before posting, duplicates may be removed
Approved Bots
founded 1 year ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
This is also the basics of quantum communications.
No spooky action at a distance
I don’t think there’s really any “changing” going on. The state of both entangled particles are unknown until one is measured, but I highly doubt that the act of measuring one suddenly determines the other’s state. They were already in those states, but before measurement it was an unknown variable which could be treated as a superposition. Once one is measured, then you know the state of the other entangled particle. Not because the act of measuring one affects the other (see: spooky action), but simply because the nature of entangled particles means the other would have to have to be the opposite of what you measured.
There’s no remote interaction, it’s simply mutual information
At least, that’s my take
Edit: this is why we can’t use entanglement for FTL communication. It just doesn’t work like that
Edit 2: seems my understanding was way off, but I’m leaving this comment up for the sake of context for the replies.. Thanks to the people that responded for trying to clear things up. Quantum physics is weird.
Ah yeah kinda, The two particles would be in a super position state. Meaning that there could be a number of possible states and each state has a certain probability.
The reason quantum entanglement is so weird, Is that by measuring one Particle changes the state of the other particle, it is in fact spooky action at a distance. How these particles communicate with each other is unknown but we cannot use it as a communication method because the act of measuring one of the particles destroys the entanglement. The states of the particles are random before we measure it. There is no state at which both particles agree upon before they're separated.
When the two particles are entangled, no "information" is communicated. So we can think of it as The particles exchanging random information that has no use to anything. This solves the faster than light communication problem because no real information is sent, Only random data. They're experiments that try to test this hypothesis called the quantum eraser.
This is a common misunderstanding due to trying to think of things classically. I'd recommend "the road to reality" by Penrose if you want a better understanding.
Also it is not why we cannot use entanglement for FTL info, but you'll understand that more once you understand entanglement better.
Just started reading this and it feels WAAAY over my head but I'm going to take author's word for it that I will glean something from it.
Not really. In order to find the wave function you need to measure both particles and compare both sets of superposition info to know that the particles were entangled. The information sharing between Alice and Bob would still have to be through standard means.