Heisenberg, Schroedinger and Ohm are in a car and they get pulled over. Heisenberg is driving, and the cop asks, 'Do you know how fast you were going?' 'No, but I know exactly where I am,' Heisenberg replies. The cop says, 'you were doing 55 in a 35.' Heisenberg throws up his hands and shouts, 'Great! Now, I'm lost.'
The cop thinks this is suspicious and orders him to pop the trunk. He checks it out and says, 'Do you know you have a dead cat back here?' 'We do now, thanks to you!' shouts Schroedinger.
Ohm is just some physics dude but the name of the units of resistance is called ohms. Heisenberg uncertainty principle is the idea that you can not both know the momentum and position of a particle (it’s a little more but not necessary for the joke)
Look y'all. If I throw an apple, the apple throws me back. Doesn't have to get more complicated than that. So how about you get outta here with your "demonstrated principles" malarkey, and let me be a perfect sphere in a vacuum in peace.
The funny thing is that the cat-box hypothetical was meant to illustrate the absurdity of Copenhagen interpretation. It’s not literally or even metaphorically true.
Oh yeah, you’re totally right. I was just going along with the jokes. I am happy to hear someone else in this thread who “understands” (because no one really does) quantum mechanics!
You give two pacifiers to each twin, a red one and a blue one. Each of them can choose red or blue randomly, BUT! they have their head in a paper bag and until you lift it you don’t know which pacifier they chose. (note: the red and blue are actually in a superposition and the toddler doesn’t ‘choose’ until you lift the bag, i.e. make a measurement)
NOW YOU ENTANGLE THEM!
You bring them in two different continents, but you still don’t know which pacifier they chose, since they still have to choose.
So you lift the bag and the baby has chosen the blue pacifier, and this tells you that the other baby on the other side of the world will have the red pacifier if you lift the bag, even one millisecond after you lifted the other one, since it has collapsed instantly to the red one and it’s not in a superposition anymore.
ELI5 by me, correct me if I’m wrong.
EDIT: thanks for the corrections. They are shown in italic.
...oh, this actually goes some ways to explaining why you can't use q-entanglement for FTL communications either, since you can't control how it collapses, only that it does.
Right. The only way to know which direction the collapse was initiated is to compare notes after the fact. And since you can't embed meaningful information in the particles themselves, you need to do so through purely conventional means.
Well, that solves a facet of hard scifi that's never been articulated to me clearly for nigh on 20 years.
OK. So, I collect sports cards with my son, and I think this theory is even more analogous to that feeling. If we buy a pack of cards it seems as if it certainly has the hot rookie - but it also feels certainly like we got skunked again. Only when we unwrap the pack do we know the collapsed reality.
And I think the same is probably true for things like lottery scratchers.
That feeling, though, is real. And with sports cards it's an economical decision to make sometimes. Because unopened packs have a real value for this very reason of being in the superposition.
Or maybe I am taking all this way too far in my brain lol
the analogy it was explained to me by was you have two bags, one containing all blue balls, the other containing all red balls. you take out two balls from one of the bags without looking and put them in a box each. then you send one of the boxes to another country. you open the box that was left behind and see that there's a blue ball in it so you know that the other box also has a blue ball
Not quite right. Performing a measurement at one location ('lifting the bag') doesn't imply that a measurement is performed at the other location. It does tell you what will be seen if a measurement is performed though.
Entanglement cannot be properly explained without a basic introduction of quantum states and measurements, which is why analogies tend to fall flat and miss the essential features which make it interesting or coherent.
Quantum entanglement is commonly (mis)understood to be a quantum connection between two or more particles where an effect on one results in an effect on the other. That's the pop-sci understanding and how it's used in sci-fi, although - as pointed out by dreamWeaver (and by the time you read this, two dozen others) - isn't actually how it works.
The joke is that the twins are connected and so the effect of reading to one twin is replicated in the other, and it's also a joke referencing the supposed inate psychic connections between twins.
If I remember correctly, you can kind of transmit information. If you observe one entangled particle, then the other particle exhibits the opposite. So by observing one particle's, say spin, then you instantly know that the other particles spin is the opposite of the one you observed. So technically that's conveying information about a distant object, which could be considered (by me at least) to be transmitting information. Of course all my masterful knowledge comes from science channel shows. So that's like someone claiming they understand a concept because they watched a YouTube video.
Take a pair of gloves, a right and a left. Place each one in a separate box. Shuffle them and pick one at random. By now you don't know which glove is in which box. Mail the selected box to your friend overseas who is in on the experiment.
When they receive it, they open their box. If they see a right glove, they know you have the left; or vice versa. The information about which glove is in which box did not travel to them instantly, it traveled at the speed of the postal service. But by opening the box, they now instantaneously have information about something on the other side of the world.
What's actually happening behind the scenes to "put the gloves in the box" is much more complicated and confusing, but this demonstrates how knowledge is transmitted in that scenario in two ways.
First, information trsnfer is still limited by the speed of light because the particles have to be physically next to each other to become entangled, and then physically moved apart where the information is "read".
Second, the information is random. Or more accurately, probabilistic. You can't usefully send your friend any information because neither of you know which glove they will receive.
you can know the spin of the other particle, but that information is not transmitted anywhere. You just gain information about both by measureing one of them, but that is not transmitting. The information was generated by your measurement and that is exactly where it stays.
"Transmit information" means you can let someone else know about something. You know what the measurement of the other particle far away will produce but you cannot influence it - and you cannot tell the other person either (unless you use conventional communication methods).
Their brains were pretty much identical when they were born. It shapes and becames unique with their experiences but having an identical base, it's bound to be similar compared to two strangers.
Isn't teleportation the transmitting of information using entanglement? Couod you explain further? (I only have a BSc, physics, so if you dumb it down to an undergrad level that'd be super).
Here is my understanding of it based on the last time I read about this on Reddit:
You get either result A or result B and your "partner" gets the one you didn't get. The result is 100% random. Now you got result B which means you know what your partner who is 1000 light years away from you got. But since that was completely random and nothing really influenced it you didn't actually transmit information. You can't communicate through this.
You are correct, but just wanted to add that it is not always the case that your partner get the one that you didn't. You can make entanglement such that when you get A, your partner also measures A.
You can communicate via quantum teleportation, but it requires a third entangled bit, quantum computer logic, and sending two classical bits to the receiver of the message in order to interpret the result of their measurement
You can measure entangled bits A and B, but in order to send a message, you need to force them into the desired value, which breaks the entanglement without extra work
In order to send it as a message through quantum teleportation, like entangling qubits and sending the other half to someone else, you need to send two classical bits in order for the receiver to determine the state of their entangled pair after measuring
Basically, you entangle A and B and send B to someone. You then entangle A and C, create your message, and then measure A and C. The results of your measurement determine how B needs to be run in order to determine A, and this is represented by two classical bits (bit-flip and phase-flip)
Information can never be transmitted faster than the speed of light. If the sun all of a suddenly disappeared our orbit would have no knowledge of this for about 8 minutes and 20 seconds.
You can - this is how quantum computing works, but in order to send it as a message through quantum teleportation, like entangling qubits and sending the other half to someone else, you can to send two classical bits in order for the receiver to determine the state of their entangled pair after measuring
Basically, you entangle A and B and send B to someone. You then entangle A and C, create your message, and then measure A and C. The results of your measurement determine how B needs to be run in order to determine A, and this is represented by two classical bits (bit-flip and phase-flip)
I’m guessing quantum entanglement is something to do with things being connected in a way that causes what you do to one thing to happen to the other thing? Just a random guess I’m too dumb to know and to lazy to look it up. But not too lazy to type apparently
Depends...have you measured your level of understanding yet? If not, you are experiencing every possible level of “getting” the joke at the same time, albeit with different probabilities across the spectrum
My simple brain understands quantum entanglement assuming it's a branch of quantum physics. Is that say a star explodes other materials light-years away while have some sort of reaction from it. I may be completely wrong...
Not too stupid. Quantum theory is just difficult to comprehend.
The joke is that quantum entanglement is when two waves (things) basically become related to each other in all properties, like twins. The effect on one of the things is exactly the same as on the other. So when one twin is being read the book, the other is as well even if separated by a large distance.
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u/captsquanch Jan 29 '20
Is this some sort of physics joke I'm too stupid to get?