2017 International Workshop: Collapse of the Wave Function

Wavefunction Collapse Not Needed

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    Robert Griffiths

    There is no need for wavefunction collapse in standard quantum mechanics. Probabilities assigned by the Born rule are sufficient. In the case of measurements of a simple sort, Kraus operators can be used to generate a “collapsed state” of the measured system, but this is fully justified using the Born rule and conditional probabilities; no separate collapse postulate is needed. The macroscopic superposition (Schrodinger cat) state that results from unitary time evolution is only a mathematical tool and has no physical relevance, so it does not need to be collapsed (or decohered).

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