科研之友
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摘要
Hugh Everett thought it was preposterous to accept the Schrodinger equation as a fundamental law of quantum physics, but then assert that it is usually violated in any observation of quantum phenomena. Demanding that the Schrodinger equation always holds led him to the 'many worlds' interpretation. To avoid this conclusion, I propose that the Schrodinger equation is not fundamental, but that one should instead regard as primary a von Neumann version of the equation which lets the density matric evolve unitarily, but where conclusions reached concerning measurements always involve the non-unitary step of tracing out environmental degrees of freedom which always exist even if the system in question is the entire observable universe.
- 出版日期2015-8
