I'm reading The Structure and Interpretation of Quantum Mechanics by Hughes. He has a chapter where he develops an account of conditional probability in QM which he uses to explain the two-slit experiment and the EPR (singlet state) situation. Basically the idea is that this conditional probability function allows for talk of conditional probability in situations where the logic in non-Boolean (i.e. incompatible observables). Conditional probability is the probability of event A given that event B occurs. The rule he gives is in terms of density operators in Hilbert space and he refers to it as Luders rule (with umlauts over the u).(adsbygoogle = window.adsbygoogle || []).push({});

Anyway he argues that the rule has many very useful consequences in terms of explaining the "causal anomalies" of QM. I would really like to understand what this rule is really saying in practical terms (i.e. not just the math). Any help appreciated. Thanks.

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# Could someone explain Luders Rule?

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