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A Idea concerning Quantum Entanglement

  1. Nov 4, 2015 #1
    Hello everyone.
    Today I was pondering quantum mechanical phenomenon, and I was focusing on quantum entanglement specifically. I came up with an interesting theory - and while it has no mathematical proof or possible way of experimenting with it - I still want to hear what you guys have to say.

    Alright so here's the theory:
    We're all aware that quantum entanglement seems to have faster than light communication. This has puzzled many physicists as this seems to violate GR theory. However, something that I believe that many physicists fail to remember is that space is expanding at a speed faster than light.
    Through virtual particles, we can observe that quantum mechanical properties are fundamentally intrinsic within the fabric of space-time. And so, using this knowledge, could one contend that communication between two entangled particles is correlated within space-time - and thus allowing this communication between entangled objects to travel at faster than light speeds?
     
  2. jcsd
  3. Nov 4, 2015 #2

    Mentz114

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    I have to be blunt and say this is too wrong to refute quickly. I can only suggest you do some more learning.
     
  4. Nov 4, 2015 #3
    Well I'm actually only in high school, but recently just was learning about quantum mechanics and I thought it was an interesting idea.

    My simple hypothesis is as follows:
    Sense we know that quantum entanglement could play a fundamental role in the fabric of space-time (here's a paper discussing it):https://www.quantamagazine.org/20150428-how-quantum-pairs-stitch-space-time/, and sense we know that space is expanding at a rate faster than light, could it be possible that the reason communication between entangled particles being faster than light is due to this correlation?
     
  5. Nov 4, 2015 #4

    bhobba

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    The very concept of entanglement is mathematical.

    First you need to understand superposition. It is this - if |a> and |b> are quantum states then c1*|a> + c2*|b> where c1 and c2 are complex numbers is also a state.

    Entanglement is an extension of superposition to different systems. Suppose two systems can be in state |a> and |b>. If system 1 is in state |a> and system 2 is in state |b> that is written as |a>|b>. If system 1 is in state |b> and system 2 is in state |a> that is written as |b>|a>. But we now apply the principle of superposition so that c1*|a>|b> + c2*|b>|a> is a possible state, The systems are entangled - neither system 1 or system 2 are in a definite state - its in a peculiar non-classical state the combined systems are in.

    There is nothing mystical going on - its simply part of the basic mathematics of QM.

    The strange things you have read about entanglement having FTL etc etc is now easy to understand. If system 1 is observed to be in state |a> then system 2 must be in state |b> and conversely if system 1 is in state |b> system 2 must be in state |a>. Its easy really.

    Why is there all this discussion about it? Check out:
    http://drchinese.com/David/Bell_Theorem_Easy_Math.htm

    Thanks
    Bill
     
  6. Nov 4, 2015 #5

    Mentz114

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    I certainly don't know (or believe) this.
    As bhobba says, there is no FTL communication. It is a correlation.
     
  7. Nov 4, 2015 #6
    Thanks for the article - really appreciate it.
    Also if you don't mind I have a few questions.
    Although this paper illustrates through the mathematical formulation of quantum mechanics why two particles' are spins are separate, it appears to me that it does not explain how the entangled particles communicate to each other which one should contain a certain spin. To say that they were entangled in that manner is essentially the hidden variable theory.
     
  8. Nov 4, 2015 #7

    bhobba

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    Why do you think they must communicate?

    Put a blue slip of paper in an envelope and a red slip on another. Mix them up and one to the other side of the universe. Open one envelope and see it for example is blue. You know instantaneously the other is red. Did they communicate?

    Have a look at Bells original paper on it:
    https://cds.cern.ch/record/142461/files/198009299.pdf

    The thing here is don't read more into it than necessary. All you have is a correlation just like the red and blue slips of paper. The rest is simply if you want to investigate if like the slips of paper it has the property of red and blue regardless of if you observe it or not. It turns out with entanglement if you want that they must communicate instantaneously, but nature doesn't have to be like that ie with properties existing regardless of observation.

    Thanks
    Bill
     
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