Information transfer via entanglement -- where is the falacy in the though experiement below?
436453
I'm not sure I follow what you're trying to ask clearly enough, but maybe this will help.\n\nWhen A 'collapses' the wave function, he's affecting it, but not.  He gains the information about the entangled photons, but he hasn't actually changed the state of the photons.\n\nWhen B goes to 'look at' the entangled photons, he also sees the collapse.  However, wavefunctions only collapse because you see them as being in a defined state - it is impossible to look at something without it being collapsed.  B cannot observe photons in jar 1 to be non-collapsed.  By looking at it, it's collapsed.\n\nThere is debate whether these wavefunction collapses are due to our observations or simply a description of our lack of knowledge prior to observation.  Taking Schrodinger's cat... observing the cat does not change whether it is dead or alive, it merely collapses the 'wavefunction' of the cat's existance to being either alive or dead.
34932
how about quantum information theory?  this encompasses some of the cool research that's going on currently, including quantum entanglement, teleportation and the 'quantum parallelism' that you get by using quantum bits in a superposition of states.  \n\nhttp://www.imaph.tu-bs.de/qi/concepts.html\nhttp://www.qubit.org/index.html\nhttp://plato.stanford.edu/entries/qt-entangle/\n\ngood luck!
29352
If you measure the state of one of the entangled particles, you instantaneously set the state of the other particle (as far as we know, even if you are across the universe).  So, your answer is yes.\n\nNote that this is not a problem for relativity, because no information is being transmitted this way.  You can measure the state, but you can't control what it ends up being.
597088
at the atomic level, there is indeed randomness. you can predict the probabillity that things will occur, but cannot know for sure unless you make a measurement, which messes up the experiment because you "contaminated" the experiment with whatever you used to measure it. for instance, if you shine a flashlight at a double slit, half the light will go through 1 slit and half will go through another. however, if you turn down the output of the flashlight to 1 photon at a time, then the same thing happens. you cannot predict which one it will go through, it is completely random.\n\noh, and quantum theorry has been proven correct, better than any other theory out there - like newtonian physics, which have been shown to be approximations of the more accurate quantum theory.
237039
Sending information through water molecules....\nWell, I suppose you could send an electric current as a signal through the water (providing some type of electrolyte is present), this could be a way of sending information.\nWater molecules are constantly moving/sloshing around, getting mixed up.  If you try to arrange the molecules a certain way in order to send information, they wont stay like that long.
121167
http://hyperphysics.phy-astr.gsu.edu/Hbase/surten.html
257269
Sounds like you're asking about a quantum mechanical phenomenon sometimes called "spooky action at a distance."\n\nIn it's most basic form, it involves two "entangled" electrons (or any subatomic particle) If you could separate the pair by some great distance--even light years--and then influence some characteristic of one electron, its distant twin would react instantly to assume the same characteristic.\n\nTry this website for a more complete explanation -->http://www.everything2.com/index.pl?node_id=138524
510606
Yes you are correct about the unknown Indian bit!! I haven't heard about either him or the experiment, and I haven't found any one else that has, but I think my 'teleportation' gear is playing up a bit, I'll get it re-tuned and try again later!! I thought teleportation was a means of transferring physical matter almost instantly? Not brain waves!!\nAre you sure your brain waves haven't been transfered??
30549
No no in classical model of mathemetics.But in quantum logic one of these problem the factorization problem is solved by the Shor's algorithm..In fact this gave the scientist a new look for the quantum computation.
305772
Seems to me that if you can manipulate 2 particles into entanglement (let's say one in New York, one in LA), then you can also manipulate a third particle (in Chicago) to the qualities measured in the first.  Sorry mathematician, but your two/three particle wave function theory although fascinating doesn't apply
31450
Of course information is an important basic concept in physics. I do not understand what you even mean with this question. \n\nFor example, the restrictions that nothing can travel faster than the speed of light only refer to INFORMATION TRANSFER. \n\nThere is a huge field of quantum information theory in physics that is very active. \n\nIf you want to do dimensional analysis, as one does with other dimensional units (essentially using group theoretic principles in studying a problem), I am sure you can devise a scheme using "bits" or some other units of information and do dimensional analysis (for example, one might consider nats, shannons or hartleys; see reference below)
896110
Actually, the answer is "yes", tho in the earliest stages.  Photon teleportation is old news.  Complete atoms have been teleported, and supposedly last year, the quantum state of an information system consisting of many atoms has been teleported, tho not yet fully verified.  In addition, there are other viable approaches to forms of teleportation, probably the next most promising involving intense gravitational fields, as from wormholes or black holes.  The fact is, there exist no limitation of physics to prevent at least several forms of teleportation - it is basically just an engineering problem, massive though it may be.  Check out wikipedia's article on the subject.
556589
...photons are entangled? Just where did you hear that? Any explanation for it?
484329
see this link\nhttp://www.colorado.edu/physics/2000/quantumzone/index.html
836806
Are you referencing the time dependency of the Schroedinger equation?  Or are you implying quantization of time?
51835
The physics community thinks not, but that never proved anything. The assumption is that nothing can travel faster than light. The answers are usually along the lines of, "since quantum entanglement happens instantaneously, its faster than light, but nothing can travel faster than light, so its impossible".\n\nThere may come a future theoretical structure in which lightspeed is surpassed under some circumstances, without temporal repercussions, then this assumption does not hold.\n\nI would add that I think its possible, based on an experiment described in Brian Greenes fabric of the universe that he uses to explain that its not.\n\nIts a simple extension of the two slit experiment where, immediately after the slits you use a photon doubler to create two entangled photons for each one passing through the slits. One for each slit. One photon carries on, the other is bent off at 90 degrees using a half silvered mirror and sent a long distance.\n\nIf no measurement is made on this second photon,, the other photons act as waves and you get an interference pattern. If a measurement is made, they act as particles and you get hotspots behind each slit.\n\nMy extension is that, by choosing to measure the photons that travel a long distance, you can instantaneous make the photons produce an interference pattern or not. Such a pattern would be noticable. If the split photons have travelled many light years, this pattern should be formable in a few seconds, so the message is coded in interference / non interference. Much like morse code in dots and dashes.
926717
Surprisingly it is. See the both enclosed aticles about the theory and experiments done to prove it. In reality human mankind will not have the ability to do it for a long time.\n\nVery simplified it would work like this:\n\nIn an atom always 2 electrons on the same circle are linked. One has to have a up-spin, the other has to have a down-spin. But you do not know which one has it. Kick the elctrons out of the circle and send them into two directions. \n\nWhen you know measure the spin of one you know exactly the spin of the other one. If you would be able to manipulate one the information would be transfered immediatly to the other on. This has been done in laboratories.\n\nEInstein predicted this but nobody really believed it would work, the science community is still under a certain shock.\n\nThe challenge is to do this with all the electrons of you body.\n\nBut ther is a practible application for this. The speed of comuter today is "slow" because information is transfered in form of electrons which move in metals inside the chips, the next step would be to transport the information by light whcih is significant faster and the next step would be a "quantum-computer" where the information is transfered in the above menioned form. This would reduce the time to calculate any problem in an unbelievable way and calculations which are not possible today could be done.