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Thread: Is "X is in superposition" the same as "X is not quantum-entangled with us"?

  1. #1 Is "X is in superposition" the same as "X is not quantum-entangled with us"? 
    Forum Ph.D.
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    Y: our system; the system that we are in
    X
    : a subsystem of our system; could be a "piezoelectric tuning fork", "schrodinger cat", or "a concious guy in a sealed box"

    From what I understand:

    All quantum entanglements between X and Y must be severed in order to for X to be in superposition from the frame of reference of Y.

    Am I understanding it correctly?

    I have a question (Paraphrase of the title):
    If all quantum entanglements between X and Y are severed, then and only then is X in superposition from the frame of reference of Y. Is this true?


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    Forum Radioactive Isotope Paleoichneum's Avatar
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    First, so everyone is on the same page, cite the sources you are using for your above assertions.


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  4. #3  
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    Quote Originally Posted by RamenNoodles View Post
    All quantum entanglements between X and Y must be severed in order to for X to be in superposition from the frame of reference of Y.
    I said that because several years ago, I read a post that claimed something like:
    "You can put a particle in superposition by shooting it with photons until the particle's entanglement with you is broken (and/or whatever you are entangled with)".
    It read it online but I cannot find it.
    Quote Originally Posted by jocular View Post
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  5. #4  
    Brassica oleracea Strange's Avatar
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    Surely, being entangled requires being in a superposition of states? (But being in a superposition doesn't require being entangled.)
    Without wishing to overstate my case, everything in the observable universe definitely has its origins in Northamptonshire -- Alan Moore
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