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Which outcome occurs when measuring the spin of one electron in an Einstein-Podolsky-Rosen entangled pair?

A)Instantaneous determination of other's spin
B)Decoherence of both entangled electrons
C)Random alignment due to thermal noise
D)Progressive spin decay to ground state

💡 Explanation

When measuring the spin of one electron in an entangled pair, collapsing the wave function causes instantaneous determination of the other's spin, even at a distance because their states are correlated. Therefore, instantaneous determination results, rather than decoherence, random alignment or spin decay, which are caused by other factors or different conditions.

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