/sci/ - Science & Math

wtf. how is it possible that the particle can communicate ftl with its entangled pair?

that's spooky

if we are being watched by aliens, can't we just emit photons in a state of superposition and see if someone observes the photons? this can work because if someone detects one of our emitted photons, then we'd notice because the other photon that it's entangled with will collapse from its state of superposition. this works no matter how stealthy the spy is.

just create pair of entangled photons, one photon polarized vertically and the other horizontally, then broadcast one of them out into some specific direction of seemingly-empty space, and trap the other photon. after some time like a day, just release the trapped photon and see if it's still in a state of superposition or not.

if the photon is still in a state of superposition, then the other photon that's flying away into space hasn't been interacted with yet by anything. then you can just retrap the other photon to keep it in the state of superposition until the next day. if retrapping it is too hard, just emit another entangled pair of photons into that same direction and then wait two days next time before releasing the trapped photon.

now if the trapped photon is released and behaves like it's collapsed out of superposition, then you know that something in space interacted with the entangled broadcasted photon. it could just be a piece of dust, or rock, or aliens.

ideally, you would have a dense net of photons being broadcast outwards so you'd check the photons that are near that vicinity by seeing if their entangled partner has also collapsed. If the net is dense enough, you'd be able to tell how big that object is. If you broadcast these photons out frequently, you'd be able to tell more precisely when the photon actually hit the object.

this system can be used for more mundane things as well like detecting dark asteroids that we can't see, or even enemy stealth satellites.

I know that with entangled particles, when you measure one of them, the other instantly collapses into a corresponding state. But many times when I heard someone say that "what you do to one particle instantly affects the other over any distance", it sounded like they were getting at something more. Are there any other ways one of the entangled particles can be affected by acting on the other? Can they still affect each other after they have already collapsed into their respective states?

Can quantum entanglement be used for data transmission? Think about it.

Imagine in the future, when humans are on different planets, maybe even in different galaxies. Traditional telecommunications systems won't work. And even a single pair of entangled bits would work for serial data. Applying a certain action to the entangled bit would represent a 1, and another action could represent a 0. Get something to quickly manipulate the entangled bits and you have a fast sequence of data. Right?

Rate my hypothesis:

Let's imagine that a photon is an 8-ball. with the density of a ping pong ball. floating in a pool. the 8ball is spinning eratically, sometimes the 8 shows, sometimes it doesn't. When you see the 8 facing up, you can be sure that the 8 is not underwater.

Now the surface of the pool is a sheet of paper, and there is no water. You are on one side of the sheet and observe the position of the 8. From that you determine the particles' spin. But you can only see one half of the particle at all times!

Suddenly, SPDC! Someone folded the piece of paper in half, and now an observer on one side of the sheet can see both halves! however, for this guy, the 8ball halves are in two separate places!

the 8ball still spins unpredictably, yet the observer always observes inverse resdings on each halves.

EXPERIMENT TIME!

let's smash photons, and see if they turn into wormholes or destabilize the universe.

TLDER: bosons can never have less than 0.5MeV, or maybe the standard model is actually a monolithic particle.

but I think it would be really cool if we could tear open photons and use them as portalts

Hi /sci
Educate me about the quantum entanglement and the spooky action at a distance.

https://www.youtube.com/watch?v=ZuvK-od647c

This video explains some of it, but how does it work? Please answer.

Somebody here into quantummechanics?
If so what do you like about and whats your favorite theory?

Hi /sci/, I'm not a frequent visitor of this board, but I gotta ask...

Can we use quantum entanglement to achieve 0 latency communication? From what I understand, waves have to travel while quantum entanglement is just instantaneous.

Recently learned about the transatlantic telegraph, will this be the another giant step of distant communications?

http://www.youtube.com/watch?v=9lOWZ0Wv218

So, is there any way that we can actually modify an entangled particles quantum state so that we can observe the reciprocal change taking place in the particle's partner?

If not, how do we know that they can actually send signals to one another, and not that they're just behaving the same way for other reasons?

does anyone know some good articles on quantum entanglement? Would be appreciated a lot

What is the fastest rate at which we can receive information? Is it the speed of light?

Ponder this: Two particles are in a superposition of each other and correlated, then separated. When a measurement is taken on one of the particles, the other particle MUST be in an opposite state. Therefore, if the two particles are separated by a large distance and the first particle is determined to be spin up, then we know at that instant, the second particle is spin down. Even with a large distance separation, how do we know the state of the second particle immediately, thus faster than the speed of light?

Does anyone know how in hell quantum entanglement works? I'm just wondering if we have an idea why the become entangled and what keeps them that way.

Why couldn't quantum entanglement be used for FTL communication?

Quantum entanglement.
Two particles entangled, when you make a measurement on one, you instantly know something of the other.

I know you cannot transfer information this way.

Let "observe" = make a measurement of any kind

Scenario:
Two entangled particles sit at Site A and Site B, Each Site has a worker ready to observe the particle at their site.

When Site A's worker makes an observation of Particle A, they instantly know properties of Particle B. When Site B's worker observes Particle B, he instantly knows properties about Particle A, even though the particle's wave function has already collapsed (Wave function collapse, is that the right term when you observe the particle?) when Worker A made the first observation.

Question:
Is it possible for Worker B to realise that Particle B has already been observed via Worker A?

Or to word it another way, is it possible to tell if the particle has already been observed.

Quantum entanglement.
Two particles entangled, when you make a measurement on one, you instantly know something of the other.

I know you cannot transfer information this way.

Let "observe" = make a measurement of any kind

Scenario:
Two entangled particles sit at Site A and Site B, Each Site has a worker ready to observe the particle at their site.

When Site A's worker makes an observation of Particle A, they instantly know properties of Particle B. When Site B's worker observes Particle B, he instantly knows properties about Particle A, even though the particle's wave function has already collapsed (Wave function collapse, is that the right term when you observe the particle?) when Worker A made the first observation.

Question:
Is it possible for Worker B to realise that Particle B has already been observed via Worker A?

http://www.youtube.com/watch?v=n426PazcFXE&feature=related

According to quantum mechanics, God did it.

It seems as though Science may have finally "found" God!

So /sci/, is this true? Has quantum mechanics led you to God?

ITT: Things in science that make you Lol wut?

EPR paradox, and quantum entanglement.