An inconsistent friend

@article{Pusey2018AnIF,
  title={An inconsistent friend},
  author={Matthew F Pusey},
  journal={Nature Physics},
  year={2018},
  volume={14},
  pages={977-978}
}
Are there limits to the applicability of textbook quantum theory? Experiments haven’t found any yet, but a new theoretical analysis shows that treating your colleagues as quantum systems might be a step too far. 
Events in quantum mechanics are maximally non-absolute
The notorious quantum measurement problem brings out the difficulty to reconcile two quantum postulates: the unitary evolution of closed quantum systems and the wave-function collapse after a
Single-world consistent interpretation of quantum mechanics from fundamental time and length uncertainties
Within ordinary ---unitary--- quantum mechanics there exist global protocols that allow to verify that no definite event ---an outcome to which a probability can be associated--- occurs. Instead,
Are Non-Boolean Event Structures the Precedence or Consequence of Quantum Probability?
TLDR
This paper will avail of Pitowsky's program, along with its extensions in the work of Jeffrey Bub and William Demopoulos, to better explicate QBism's aims and goals.
Quantum Information in Neural Systems
TLDR
The presented results show that fast decoherence timescales could assist cognitive binding through quantum entanglement across extensive neural networks in the brain cortex, and show that quantum coherence of individual subsystems cannot be used for cognitive binding because it is a physical mechanism that leads to separability and non-interaction.
Copenhagen Interpretation Can Survive the Upgraded Schrödinger’s cat Gedankenexperiment
Recently, Frauchiger and Renner proposed a Gedankenexperiment, which was claimed to be able to prove that quantum theory cannot consistently describe the use of itself. Here we show that the
PHYSICAL REVIEW A 101, 032107 (2020) Decoherence framework for Wigner’s-friend experiments
TLDR
A framework in which all the experimental outcomes arise from unitary evolutions is proposed, showing that the agents’ claims become consistent if the changes in their memories are properly taken into account and opens the door to future realizations on quantum machines.
Respecting One’s Fellow: QBism’s Analysis of Wigner’s Friend
According to QBism, quantum states, unitary evolutions, and measurement operators are all understood as personal judgments of the agent using the formalism. Meanwhile, quantum measurement outcomes
Decoherence framework for Wigner's-friend experiments
The decoherence interpretation of quantum measurements is applied to Wigner’s friend experiments. A framework in which all the experimental outcomes arise from unitary evolutions is proposed. All the
Decoherence framework for Wigner's-friend experiments
TLDR
This framework shows that the agents' claims become consistent if the changes in their memories are properly taken into account, and can be used to build a consistent scenario for the recently proposed extended versions of the Wigner's-friend experiment.

References

SHOWING 1-7 OF 7 REFERENCES
Testing the limits of quantum mechanical superpositions
Testing the limits of the quantum mechanical description of nature has become a subject of intense experimental interest. Recent advances in investigating macroscopic quantum superpositions are
An introduction to QBism with an application to the locality of quantum mechanics
We give an introduction to the QBist interpretation of quantum mechanics, which removes the paradoxes, conundra, and pseudo-problems that have plagued quantum foundations for the past nine decades.
Single-World Theory of the Extended Wigner’s Friend Experiment
Frauchiger and Renner have recently claimed to prove that “Single-world interpretations of quantum theory cannot be self-consistent”. This is contradicted by a construction due to Bell, inspired by
Evidence for the epistemic view of quantum states: A toy theory
We present a toy theory that is based on a simple principle: the number of questions about the physical state of a system that are answered must always be equal to the number that are unanswered in a
Relational quantum mechanics
I suggest that the common unease with taking quantum mechanics as a fundamental description of nature (the “measurement problem”) could derive from the use of an incorrect notion, as the unease with
Models of Wave-function Collapse, Underlying Theories, and Experimental Tests
We describe the state of the art in preparing, manipulating and detecting coherent molecular matter. We focus on experimental methods for handling the quantum motion of compound systems from diatomic
Single-world interpretations of quantum theory cannot be self-consistent
TLDR
A gedankenexperiment is proposed where quantum theory is applied to model an experimenter who herself uses quantum theory, and it is found that no single-world interpretation can be logically consistent.