Self-testing refers to the possibility of characterizing an unknown quantum device based only on the observed statistics. Here we develop methods for self-testing entangled quantum measurements, a key element for quantum networks. Our approach is based on the natural assumption that separated physical sources in a network should be considered independent. This provides a natural formulation of the problem of certifying entangled measurements. Considering the setup of entanglement swapping, we derive a robust self-test for the Bell-state measurement, tolerating noise levels up to 5%. We also discuss generalizations to other entangled measurements.
@article{arxiv.1807.04956,
title = {Self-testing entangled measurements in quantum networks},
author = {Marc-Olivier Renou and Jędrzej Kaniewski and Nicolas Brunner},
journal= {arXiv preprint arXiv:1807.04956},
year = {2022}
}
Comments
15 pages, 3 figures. See also related work by J.-D. Bancal et al