Bell inequality violations with random mutually unbiased bases
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 . 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.
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