> On Jun 10, 2025, at 3:44, Pieter Steenekamp <[email protected]>
> wrote:
>
> I'll let George answer:
> EPR refers to the Einstein-Podolsky-Rosen paradox, a 1935 thought experiment
> by Einstein, Podolsky, and Rosen. It challenges the completeness of quantum
> mechanics by showing that, under its rules, two particles can become
> entangled—so that measuring one instantly affects the other, no matter how
> far apart they are.
>
That’s an incorrect use of English to refer to what the math actually says. At
least here, George isn’t hallucinating; they is (we have to use that for the
AI, no?) repeating the nonsense people say.
The specific error is “affects”, which is a causation-related word. Causation
remains consistent with timelike separations within relativity, and if we
convert its math properly into English we also should not use expressions like
“faster-than-light signal”, as there isn’t any “travel” process in that
geometry to be referred to as “faster-than-light”. What there is in the EPR
experiment is prior correlation in the state vector, which propagates by
perfectly proper causality to both observers, and which can be reported out in
an unfolding “knowledge about” the values correlation functions will take as
one or the other of them performs a measurement.
Scott Aaronson, thankfully, translates math into English that says the same
thing. One can start on p.41 and then go to the next lecture, though some
flashback will be needed here and there to define terms he is just using by
p.41:
https://www.scottaaronson.com/qclec.pdf
Eric
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