English

Bell inequality violations with random mutually unbiased bases

Quantum Physics 2022-07-19 v2

Abstract

We examine the problem of exhibiting Bell nonlocality for a two-qudit entangled pure state using a randomly chosen set of mutually unbiased bases (MUBs). Interestingly, even if we employ only two-setting Bell inequalities, we find a significant chance of obtaining a Bell violation if the two parties are individually allowed to measure a sufficient number of MUBs. In particular, for the case of maximally entangled qutrits and ququarts, our numerical estimates indicate that we can obtain near-guaranteed Bell violation by considering only such Bell inequalities. The case of maximally entangled ququints is similar, albeit the chance of ending up with a successful trial decreases somewhat to approximately 99.84%99.84\%. Upon a closer inspection, we find that even all these no-violation instances violate some more-setting Bell inequalities. These results suggest that the experimental tests of Bell nonlocality for these higher-dimensional entangled states remain viable even if the two parties do not share a common reference frame.

Keywords

Cite

@article{arxiv.2205.04037,
  title  = {Bell inequality violations with random mutually unbiased bases},
  author = {Gelo Noel M. Tabia and Varun Satya Raj Bavana and Shih-Xian Yang and Yeong-Cherng Liang},
  journal= {arXiv preprint arXiv:2205.04037},
  year   = {2022}
}

Comments

10+1 pages, 9 figures, 6 tables. v2 is essentially the same as the published version

R2 v1 2026-06-24T11:11:00.661Z