PIRSA:18040084 Conference

DOI10.48660/18040084

Conference/School: Observers in Quantum and Foil Theories

Galley, T. (2018). Compatibility of implicit and explicit observers in quantum theory and beyond. Perimeter Institute. https://pirsa.org/18040084

Galley, Thomas. Compatibility of implicit and explicit observers in quantum theory and beyond. Perimeter Institute, Apr. 02, 2018, https://pirsa.org/18040084 

@misc{ pirsa_PIRSA:18040084,
  doi = {10.48660/18040084},
  url = {https://pirsa.org/18040084},
  author = {Galley, Thomas},
  keywords = {},
  language = {en},
  title = {Compatibility of implicit and explicit observers in quantum theory and beyond},
  publisher = {Perimeter Institute},
  year = {2018},
  month = {apr},
  note = {PIRSA:18040084 see, \url{https://pirsa.org}}
}

Abstract

The observer is implicitly present in the measurement postulates of quantum theory. However the observer can also be modeled as a quantum system interacting with other quantum systems. A theory where every action implicitly undertaken by an agent (such as a measurement or preparation) can be explicitly modeled as non-classical systems interacting is called a universal theory. By modifying the measurement postulates of quantum theory (and preserving the other postulates) we create theories where the observer can still be explicitly modeled as a pure quantum state, but where the implicit observer is different. We argue that any modification of the measurement postulates of quantum theory gives a theory which is not universal. That is to say there are certain actions implicitly carried out by an agent which cannot be explicitly modeled.

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