Unitary-Only Quantum Theory Cannot Consistently Describe the Use of Itself: On the Frauchiger-Renner Paradox

@article{Kastner2020UnitaryOnlyQT,
  title={Unitary-Only Quantum Theory Cannot Consistently Describe the Use of Itself: On the Frauchiger-Renner Paradox},
  author={Ruth E. Kastner},
  journal={arXiv: Quantum Physics},
  year={2020}
}
  • Ruth E. Kastner
  • Published 2020
  • Mathematics, Physics
  • arXiv: Quantum Physics
  • The Frauchiger-Renner Paradox is an extension of paradoxes based on the 'Problem of Measurement,' such as Schrodinger's Cat and Wigner's Friend. All of these paradoxes stem from assuming that quantum theory has only unitary (linear) physical dynamics, and the attendant ambiguity about what counts as a 'measurement'--i.e., the inability to account for the observation of determinate measurement outcomes from within the theory itself. This paper discusses a basic inconsistency arising in the FR… CONTINUE READING

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