Fetching the paper…

Reading the bibliography…

Wigner's friend as a rational agent · Around

2019

Wigner's friend as a rational agent

Baumann, Veronika, Brukner, Časlav

Original
PDF
Post on X

Understand

In a joint paper Jeff Bub and Itamar Pitowski argued that the quantum state represents `the credence function of a rational agent [...] who is updating probabilities on the basis of events that occur'.

In the famous thought experiment designed by Wigner, Wigner's friend performs a measurement in an isolated laboratory which in turn is measured by Wigner.
Here we consider Wigner's friend as a rational agent and ask what her `credence function' is.
We find experimental situations in which the friend can convince herself that updating the probabilities on the basis of events that happen solely inside her laboratory is not rational and that conditioning needs to be extended to the information that is available outside of her laboratory.

Built on

Assessment of everett’s “relative state” formulation of quantum theory
John A Wheeler · 1957
Earlier work this paper cites.
The problem of measurement
Eugene P Wigner · 1963
Earlier work this paper cites.
Unified dynamics for microscopic and macroscopic systems
Gian Carlo Ghirardi, Alberto Rimini, and Tullio Weber · 1986
Earlier work this paper cites.
Relational quantum mechanics
Carlo Rovelli · 1996
Earlier work this paper cites.

Similar

Wavefunction collapse as a real gravitational effect
ROGER PENROSE · 2000
Cited alongside, same era.
Qbism, the perimeter of quantum bayesianism
Original
Christopher A Fuchs · 2010
Cited alongside, same era.
Gravity-related wave function collapse
Lajos Diósi · 2014
Cited alongside, same era.
On the quantum measurement problem
Original
Časlav Brukner · 2015
Cited alongside, same era.

Then

On formalisms and interpretations
Veronika Baumann and Stefan Wolf · 2018
Later among the works it cites.
A no-go theorem for observer-independent facts
Časlav Brukner · 2018
Later among the works it cites.
Quantum theory cannot consistently describe the use of itself
Daniela Frauchiger and Renato Renner · 2018
Later among the works it cites.

Beyond the bibliography

alphaXiv searches the wider corpus for related work and actual follow-ups.

Open on alphaXiv

alphaXiv is searching for related work…