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Testing the reality of Wigner's friend's experience
Author(s): Kok-Wei Bong; Aníbal Utreras-Alarcón; Farzad Ghafari; Yeong-Cherng Liang; Nora Tischler; Eric G. Cavalcanti; Geoff J. Pryde; Howard M. Wiseman
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Paper Abstract

Quantum mechanics is a robust theory which pro duces highly accurate predictions. Despite its successes, it is still plagued with controversies like the measure- ment problem. In short, the measurement problem is the conflict between the evolution of the wavefunction described by Schro¨dinger’s equation and the apparent collapse of the wavefunction after a measurement is done. The Wigner’s friend paradox illustrates the conflict be- tween the two rules. In the thought experiment, we consider an observer (Wigner’s friend) who is able to per- form measurement on the quantum system and assign a quantum state. Wigner is a super-observer who is able to measure the laboratory his friend is in and also as- sign a quantum state. This process, however, leads to a quantum state that does not ascribe a well-defined value to the outcome of the friend’s observation, in apparent contradiction with the friend’s perspective.

Paper Details

Date Published: 30 December 2019
PDF: 2 pages
Proc. SPIE 11200, AOS Australian Conference on Optical Fibre Technology (ACOFT) and Australian Conference on Optics, Lasers, and Spectroscopy (ACOLS) 2019, 112001C (30 December 2019); doi: 10.1117/12.2540002
Show Author Affiliations
Kok-Wei Bong, Australian Research Council (Australia)
Aníbal Utreras-Alarcón, Australian Research Council (Australia)
Farzad Ghafari, Griffith Univ. (Australia)
Yeong-Cherng Liang, National Cheng Kung Univ. (Taiwan)
Nora Tischler, Griffith Univ. (Australia)
Eric G. Cavalcanti, Griffith Univ. (Australia)
Geoff J. Pryde, Griffith Univ. (Australia)
Howard M. Wiseman, Griffith Univ. (Australia)


Published in SPIE Proceedings Vol. 11200:
AOS Australian Conference on Optical Fibre Technology (ACOFT) and Australian Conference on Optics, Lasers, and Spectroscopy (ACOLS) 2019
Arnan Mitchell; Halina Rubinsztein-Dunlop, Editor(s)

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