measurements in quantum mechanicsOne may also mention the so-called many-worlds interpretation, proposed by Hugh Everett III in 1957, which suggests that, when a measurement is made for a system in which the wave function is a mixture of states, the universe branches into a number of noninteracting universes. Each of the possible outcomes of the measurement occurs, but in a different universe. Thus, if...A third tradition of attempts to solve the measurement problem originated in a proposal by the American physicist Hugh Everett (1930–82) in 1957. According to the so-called “many worlds” hypothesis, the measurement of a particle that is in a superposition of being in region A and being in region B results in the instantaneous “branching” of the universe into two...
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