11 March: Laura Felline, “The Measurement Problem in Quantum Information Theory”

Our next visitor in the FraMEPhys Seminar series was Dr Laura Felline (Roma Tre) who spoke on Monday 11th March. Laura’s title was ‘The Measurement Problem in Quantum Information Theory’ and her abstract was as follows:

“In this talk I criticize the idea, wide-spread between the advocates of Quantum Information Theory, that in order to explain away the measurement problem it is sufficient to reject the assumption that the quantum state represents physical objects. In order to do that, I will analyse three notable information-theoretic approaches to QT: Bub’s new information-theoretic interpretation (as a representative of a psi-ontic approach), Pitowsky’s Bayesian interpretation (as a representative of an objective psi-epistemic approach) and Qbism (as a representative of a subjective psi-epistemic approach) and argue that the measurement problem still affects the first two interpretations, while Qbism leads to an unacceptable clash between the alleged content of quantum theory and scientific practice.”

Laura argued that the Wigner’s friend thought-experiment, for different reasons in each case, undermines all of the main information-theoretic ‘solutions’ to the measurement problem.

Before the talk, there was a reading group with the speaker in ERI G54 from 1.30-2.30pm. The paper discussed was “An Introduction to QBism with an Application to the Locality of Quantum Mechanics” by Fuchs, Mermin and Schack, available here: https://arxiv.org/pdf/1311.5253.pdf

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