71–80 of 166 posts
I’ve been working on quantum computing and quantum communication for 15 years now and what I really want people to know is that entanglement is “beyond classical correlation.” Correlation which is not beyond classical is shaking up a shoebox with a pair of gloves in it, and having two people take the gloves far away from each other to then observe what hand they got. They then understand the hand the other has. There…
"3 Body Problem" has so many problems! Wake me up when the next "Expanse"-level sci-fi lands.
Every time a seemingly intelligent person takes the dark forest hypothesis seriously I am dismayed. The only answer to the dark forest is: FTL is impossible and we are presently incapable of detecting ourselves at a distance of 4 LY so there is a 0.0% chance of detecting anything beyond that.
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I was under the impression that local hidden variable theories had been disproven? It could be nonlocal of course, but that would imply information moving faster than light again. Unless you count the entirety of MWI as "hidden variables", I guess?
Yeah, I am aware of Bell's theorem. What I am saying is that the hidden variable hypothesis is nonetheless a good mental model as a first approximation to reason about QE, say as a non-professional physicist. People get confused, especially sci-fi authors, adding to the general confusion about anything touching Quantum Physics being almost magical/limitless or unexplainable. This is a lot more pedestrian in practice.
I very much doubt Ursula Le Guin thought we could build an ansible (FTL comms) any more than Larry Niven thinks the Teela Brown gene (heritable luck) is real.
What I am saying is that, in my understanding, there is no action that can occur without a particle that acts, and since no particle can travel FTL, nothing can happen FTL.
In the case of Quantum entanglement, mustn't some particle travel from the first quantum thing to the entangled quantum thing in order to have an effect?
I believe that my understanding is flawed! I don't know how to get a clearer view though. Any advice?
I think it'd be cool to set up colonies on other planets, or hell, other solar systems, but the inability to communicate seems like a pretty hard blocker. I mean, even sticking to the solar system, will start taking six hours for the light to even reach earth from Pluto, assuming it can even have a direct path.
I don't know anything about physics, so I was hoping that the entanglement hypothesis might allow us to fix that, but clearly that wasn't the case. This makes me sad.
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> If so, that is not a great analogy other than to illustrate a historical & incorrect perspective. Read the next part, I was discussing the idea thought of by Einstein that was dismissed by Bell's theorem. > Okay, say you 'do some entanglement of multiple particles stored in two separate tubes' where you know there is some kind of pattern in the entanglement. Is the issue that there is no way to know how to find tha…
Well, we know entanglement happens because of experiments. In those experiments, researchers had to somehow independently verify that the entangled states produced predictable results, thereby demonstrating the entanglement. If you set up the first part of experiment, wherein you know certain particles are entangled, would it be possible for someone on one side of that entanglement to read a pattern from that side al…
Earlier quoted context omitted.
I was under the impression that local hidden variable theories had been disproven? It could be nonlocal of course, but that would imply information moving faster than light again. Unless you count the entirety of MWI as "hidden variables", I guess?
Non-Locality doesn’t mean information travels faster than c. The main article attempts to explain why instantaneous “spooky action at a distance” is real, yet information can’t be relayed this way.
I'll show myself out
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> One hypothesis is that there is no spooky action. One particle was 'always' going to resolve one way, likewise with the other. Like inspecting 'heads' on one side of a coin 'forces' 'tails' onto the other side. > I accept that this coin-hypothesis has been disproved by people who actually know what they're talking about. The quantum erasure experiment is to my mind the best example of the spooky action at a distanc…
Delayed-choice blew my mind at first, but then learning that light-speed particles experience length contraction kind of debunks the "they traveled backwards in time" interpretation, at least from the photons perspective. They traveled 0 distance.
Basically the results of two slits with particles combine into no pattern. If you retroactively keep track of which slit, and then only look at that slit, it makes a pattern.
I read a book about particle physics and understood a very small amount of it. My understanding is that you cannot have faster than light anything because nothing can travel faster than light. For instance, the gravitational field of this coffee cup in my hand spans the entire universe. The cup is gravitationally attracting me, the Earth, the Sun, and every other atom in the universe (albeit at a remarkably low level…
It makes me a little sad, because we're in this frustrating position of knowing how "effectively unlimited" the universe is, but also knowing how impossible it is to realistically explore it, at least not without a fundamental change to our understanding of physics. I think it'd be cool to set up colonies on other planets, or hell, other solar systems, but the inability to communicate seems like a pretty hard blocker…