5 ms·
I love following article: http://www.flownet.com/ron/QM.pdf http://www.flownet.com/ron/QM.pdf It basically shows that observation (measurement) and entanglemen
by sheerun 13y ago
I love following article: http://www.flownet.com/ron/QM.pdf http://www.flownet.com/ron/QM.pdf
It basically shows that observation (measurement) and entanglement are the same things.
Think about it: particles are not magically going out of superposition as we observe (measure) them. We (our atoms) become entangled with those particles, we become superposition. It's just propagation of entangled state.
Why we don't perceive ourselves as in superposition? "It turns out that this result generalizes to any number of mutually entangled particles. If we ignore any one particle, the entropy diagram of the remaining particles looks like a system of N-1 particles in a classically correlated state with a non-zero entropy.". That means each atom of our bodies perceives other atoms entangled with it as they were not in any superposition (though as a whole, the system is still in superposition). We (atoms) are constantly entangled and in superposition with our environment, but we perceive it as classical state.
In what state each atom "sees" every other? According to probability. That's why in double slit experiment we see only one of most probable outcomes, not a random one.
Time could be rate of entanglement propagation. Entanglement propagates with speed of light (speed of particles), so we seem live in same timeline. But if something moves away from us with speed of light, the time for this object goes slower, but only relative to us.
Until two particles interact with any way, they live in totally different timelines. After they "observe" each other (entangle with each other), also their time becomes entangled. That's why after we see a cup begin dropped, it becomes part of our reality, and the cup becomes broken in our time.
We live in spacetime. As mentioned in article "“Spooky action at a distance” ought to be no more and no less) mysterious than the “spooky action across time” which makes the universe consistent with itself from one moment to the next.".
Why arrow of time? The article says: "Under QIT, a measurement is just the propagation of a mutually entangled state to a large number of particles. To reverse this process we would have to "disentagngle" these quantum states. In principle this is possible. In practice it is not.". I think differently though.
That are my thoughts. Please don't judge :)
- 3rd3 13y agoI have a question: What does being in a superposition mean exactly here? I only know the term from classical mechanics, e.g. that an acceleration vector in R^3 can be seen as a superposition of three accelerations along the base vectors (a linear combination).
- sheerun 13y agoSuperposition in sense of linear combination of quantum states. For example 2-state superposition is qubit. If you think about systems can be in superposition only relative to one another. For example in double slit experiment light is in superposition relative to us, but not relative to photon from other slit. Or maybe photon in one slit does not exist in timeline of photon from other slit? I don't know :)
- nzp 13y agoIt's kind of like that. The state of a particle in classical mechanics is a linear combination of some basis vectors which are not it's states as such. But the superposition in QM is the superpositions of states. The phase space in classical mechanics is not a vector space, but in QM it is. This is a fundamental difference because in QM you can take any number of states, make a linear combination a it will result in another perfectly valid state. Not so in classical mechanics. For example, consider a particle orbiting a point. If you take some position vectors as it moves and make a linear combination, the resulting vector will not be a possible position of a particle in this system. In QM, it would necessary be another possible state. This is a slightly sloppy example, but I hope you get the gist.
- Retric 13y agoSuperposition is not a one time thing, after entanglement uncertainty shows right back up just within a smaller range.
- fspeech 13y ago"Entanglement propagates with speed of light" Hmm, never heard of this one before. "Entanglement" is a mathematical concept, why does it have anything to do with speed of light?
- sheerun 13y agoBecause particles (or waves) need to be in close spacetime interval to be entangled with each other? I'm sorry, but I'm programmer, not physician or mathematician, so I can't reliably answer.