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Thread: Question about realism

  1. #1 Question about realism 
    Junior Member
    Join Date
    Nov 2017
    I'm aware that through bell's inequality both locality and realism cannot be true. I'm in a little bit confused as to what realism means, however. I should preface this and say that I know very little of QM but I believe I understand bell's inequality.
    In bell's inequality, a measure of entangled particle seems to affect another particle in a non local way. Somehow, however, we can preserve locality f we reject realism. Why does rejecting realism preserve locality? Is it possible to understand the logic behind it conceptually rather than through mathematics? I guess what I'm asking is for a QM interpretation that maintains locality and rejects realism, and it being explained conceptually rather than mathematically as to how this works.
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  2. #2  
    Senior Member Strange's Avatar
    Join Date
    Jan 2013
    Realism means that the properties of the particles have defined values, even before they are measured. So, for example, in the case of a pair of entangled electrons one would be spin up and the other one spin down. In fact, everything we see implies non-realism; that the values are indeterminate until measured.

    Local means that there is no faster than light communication.

    "Dr Chinese" has some good explanations:
    DrChinese Presents Bell's Theorem
    Bell's Theorem with Easy Math
    You can do everything right, strictly according to procedure, on the ocean and it'll still kill you, but if you're a good navigator at least you'll know where you were when you died.
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