Page "EPR paradox" Paragraph 27
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Alice now measures the spin along the z-axis.
She can obtain one of two possible outcomes: + z or − z.
Suppose she gets + z.
According to the Copenhagen interpretation of quantum mechanics, the quantum state of the system collapses into state I.
The quantum state determines the probable outcomes of any measurement performed on the system.
In this case, if Bob subsequently measures spin along the z-axis, there is 100 % probability that he will obtain − z.
Similarly, if Alice gets − z, Bob will get + z.
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