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arXiv · 2509.13061

Resource-efficient entanglement detection in high-dimensional states via two-qubit witnesses

Josef Kadlec·Artur Barasiński·Karel Lemr
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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.

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Josef Kadlec, Artur Barasiński, Karel Lemr. 2025-09-16. Resource-efficient entanglement detection in high-dimensional states via two-qubit witnesses. https://doi.org/10.1103/7swz-fdw9

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