Experimental hierarchy of two-qubit quantum correlations without state tomography

S Abo, J Soubusta, K Jiráková, K Bartkiewicz… - Scientific Reports, 2023 - nature.com
A Werner state, which is the singlet Bell state affected by white noise, is a prototype example
of states, which can reveal a hierarchy of quantum entanglement, steering, and Bell …

Enhancing collective entanglement witnesses through correlation with state purity

K Jiráková, A Černoch, A Barasiński, K Lemr - Scientific Reports, 2024 - nature.com
This research analyzes the adverse impact of white noise on collective quantum
measurements and argues that such noise poses a significant obstacle for the otherwise …

Experimental diagnostics of entanglement swapping by a collective entanglement test

V Trávníček, K Bartkiewicz, A Černoch, K Lemr - Physical Review Applied, 2020 - APS
This paper reports on the experimental diagnostics of an entanglement-swapping protocol
by means of collective entanglement witness. Our approach is suitable to detect …

Machine classification of quantum correlations for entanglement distribution networks

J Soubusta, A Černoch, K Lemr - arXiv preprint arXiv:2402.09212, 2024 - arxiv.org
The paper suggest employing machine learning for resource-efficient classification of
quantum correlations in entanglement distribution networks. Specifically, artificial neural …

Experimental measurement of a nonlinear entanglement witness by hyperentangling two-qubit states

V Trávníček, K Bartkiewicz, A Černoch, K Lemr - Physical Review A, 2018 - APS
We demonstrate that nonlinear entanglement witnesses can be made particularly useful for
entanglement detection in hyperentangled or multilevel states. We test this idea …

Experimental verification of time-order-dependent correlations in three-qubit Greenberger-Horne-Zeilinger-class states

A Barasiński, A Černoch, K Lemr, J Soubusta - Physical Review A, 2019 - APS
In this paper, we investigate the genuine three-way nonlocality which is recognized as the
strongest form of tripartite correlations. We consider theoretically and experimentally a series …