= Complementarity
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= Quantum complementarity
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The need for mutually exclusive experimental arrangements or incompatible observables to exhibit different aspects of a quantum system. For example, path discrimination and interference contrast obey a tradeoff, while sharp <Pauli operator> $X$ and $Z$ measurements have incompatible eigenbases. <Which-path information> is an operational record, rather than a requirement that a conscious observer reads it.
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