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A system's wave function is uniquely determined by its underlying physical state
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Title  A system's wave function is uniquely determined by its underlying physical state 
Title of Series  New Journal of Physics, Volume 19, 2017 
Author 
Colbeck, Roger

License 
CC Attribution 3.0 Unported: You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor. 
DOI  10.5446/21893 
Publisher  Institute of Physics (IOP), Deutsche Physikalische Gesellschaft (DPG) 
Release Date  2017 
Language  English 
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Subject Area  Physics 
Abstract  We address the question of whether the quantummechanical wave function Ψ of a system is uniquely determined by any complete description Λ of the system's physical state. We show that this is the case if the latter satisfies a notion of 'free choice'. This notion requires that certain experimental parameters—those that according to quantum theory can be chosen independently of other variables—retain this property in the presence of Λ. An implication of this result is that, among all possible descriptions Λ of a system's state compatible with free choice, the wave function } is as objective as Λ. 