English

Can multiple observers detect KS-contextuality?

Quantum Physics 2023-12-05 v2

Abstract

KS-contextuality is a crucial feature of quantum theory. Previous research demonstrated the vanishing of NN-cycle KS-contextuality in setups where multiple independent observers measure sequentially on the same system, which we call Public Systems. This phenomenon can be explained as the additional observers' measurements degrading the state and depleting the quantum resource. This explanation would imply that state-independent contextuality should survive in such a system. In this paper, we show that this is not the case. We achieved this result by simulating an observer trying to violate the Peres-Mermin noncontextuality inequality in a Public System. Additionally, we provide an analytical description of our setup, explaining the loss of contextuality even in the state-independent case. Ultimately, these results show that state-independent contextuality is not independent of what happens to the system in-between the measurements of a context.

Keywords

Cite

@article{arxiv.2310.19564,
  title  = {Can multiple observers detect KS-contextuality?},
  author = {Arthur C. R. Dutra and Roberto D. Baldijão and Marcelo Terra Cunha},
  journal= {arXiv preprint arXiv:2310.19564},
  year   = {2023}
}

Comments

8+3 pages, 5 figures. Revised justification for Eq. (11), results unchanged

R2 v1 2026-06-28T13:05:57.190Z