Limits Of Quantum Information In Weak Interaction Processes Of Hyperons

Author(s)
B. C. Hiesmayr
Abstract

We analyze the achievable limits of the quantum information processing of the weak interaction revealed by hyperons with spin. We find that the weak decay process corresponds to an interferometric device with a fixed visibility and fixed phase difference for each hyperon. Nature chooses rather low visibilities expressing a preference to parity conserving or violating processes (except for the decay Sigma(+) -> p pi(0)). The decay process can be considered as an open quantum channel that carries the information of the hyperon spin to the angular distribution of the momentum of the daughter particles. We find a simple geometrical information theoretic interpretation of this process: two quantization axes are chosen spontaneously with probabilities 1+alpha/2 alpha where a is proportional to the visibility times the real part of the phase shift. Differently stated, the weak interaction process corresponds to spin measurements with an imperfect Stern-Gerlach apparatus. Equipped with this information theoretic insight we show how entanglement can be measured in these systems and why Bell's nonlocality (in contradiction to common misconception in literature) cannot be revealed in hyperon decays. Last but not least we study under which circumstances contextuality can be revealed.

Organisation(s)
Particle Physics
Journal
Scientific Reports
Volume
5
No. of pages
10
ISSN
2045-2322
DOI
https://doi.org/10.1038/srep11591
Publication date
07-2015
Peer reviewed
Yes
Austrian Fields of Science 2012
103034 Particle physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/limits-of-quantum-information-in-weak-interaction-processes-of-hyperons(16a34510-61eb-42e8-9624-a1fa04fe3b36).html