Is it possible to design a system where a detector is entangled with the particle state it detects (before it is detected), and to create a paradox from this?

Upon observance of a state by the detector, a correlation between the particle and any entangled particles will instantly occur; fi a reverse spin. What if these happen in the detector and affect detection?

I cannot think of any paradoxes or “deadlock” scenarios but I was wondering if literature knows of any.

I think it could be somewhat of an argument against traditional simulation theories.

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    $\begingroup$ You can read up on "Wigner's friend", see e.g. the Wikipedia page and references therein. $\endgroup$ Commented Jan 17, 2021 at 21:38
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    $\begingroup$ Measurement is entanglement. $\endgroup$
    – my2cts
    Commented Jan 17, 2021 at 23:27
  • $\begingroup$ I know @my2cts but that happens “too late” $\endgroup$
    – buddhabrot
    Commented Jan 18, 2021 at 1:46
  • $\begingroup$ @my2cts that's, at best, an overly vague statement. A "measurement" is something you perform on a system. Entanglement is a property of a system. So no, they are not the same thing. $\endgroup$
    – glS
    Commented Jan 18, 2021 at 13:29
  • $\begingroup$ @glS I mean that measurement is a form of entanglement. Hope that is clear enough. $\endgroup$
    – my2cts
    Commented Jan 18, 2021 at 13:37


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