Resource-efficient entanglement detection in high-dimensional states via two-qubit witnesses
Quantum Physics
2026-02-25 v1
Abstract
This paper presents an efficient method for detecting entanglement in high-dimensional two-qudit states by mapping the Hilbert space onto the space of two qubits. This transformation enables the use of well-established two-qubit entanglement witnesses. The proposed approach is not restricted to any specific class of states, successfully identifies a vast majority of pure entangled states, and requires a number of measurements that does not increase with the dimensionality of the qudits. The method demonstrates solid sensitivity when applied to two notable classes of states, incomplete-permutation-symmetric states and random pure states mixed with white noise, and is shown to be feasible with current experimental techniques.
Keywords
Cite
@article{arxiv.2509.13061,
title = {Resource-efficient entanglement detection in high-dimensional states via two-qubit witnesses},
author = {Josef Kadlec and Artur Barasiński and Karel Lemr},
journal= {arXiv preprint arXiv:2509.13061},
year = {2026}
}