$k$-Entanglement Measure for Multipartite Systems without Convex-Roof Extensions and its Evaluation

Fuente: arXiv
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Autores principales: Guo, Jie, Yang, Shuyuan, Hou, Jinchuan, Qi, Xiaofei, He, Kan
Formato: Preprint
Publicado: 2025
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author Guo, Jie
Yang, Shuyuan
Hou, Jinchuan
Qi, Xiaofei
He, Kan
author_facet Guo, Jie
Yang, Shuyuan
Hou, Jinchuan
Qi, Xiaofei
He, Kan
contents Multipartite entanglement underpins quantum technologies but its study is limited by the lack of universal measures, unified frameworks, and the intractability of convex-roof extensions. We establish an axiomatic framework and introduce the first \emph{true} $k$-entanglement measure, $E_w^{(k,n)}$, which satisfies all axioms, establishes $k$-entanglement as a multipartite quantum resource, avoids convex-roof constructions, and is efficiently computable. A universal algorithm evaluates arbitrary finite-dimensional states, with open-source software covering all partitions of four-qubit systems. Numerical tests certify $k$-entanglement within 200 seconds, consistent with necessary-and-sufficient criteria, tightening bounds and revealing new thresholds. This framework offers a scalable, practical tool for rigorous multipartite entanglement quantification.
format Preprint
id arxiv_https___arxiv_org_abs_2512_12588
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle $k$-Entanglement Measure for Multipartite Systems without Convex-Roof Extensions and its Evaluation
Guo, Jie
Yang, Shuyuan
Hou, Jinchuan
Qi, Xiaofei
He, Kan
Quantum Physics
Multipartite entanglement underpins quantum technologies but its study is limited by the lack of universal measures, unified frameworks, and the intractability of convex-roof extensions. We establish an axiomatic framework and introduce the first \emph{true} $k$-entanglement measure, $E_w^{(k,n)}$, which satisfies all axioms, establishes $k$-entanglement as a multipartite quantum resource, avoids convex-roof constructions, and is efficiently computable. A universal algorithm evaluates arbitrary finite-dimensional states, with open-source software covering all partitions of four-qubit systems. Numerical tests certify $k$-entanglement within 200 seconds, consistent with necessary-and-sufficient criteria, tightening bounds and revealing new thresholds. This framework offers a scalable, practical tool for rigorous multipartite entanglement quantification.
title $k$-Entanglement Measure for Multipartite Systems without Convex-Roof Extensions and its Evaluation
topic Quantum Physics
url https://arxiv.org/abs/2512.12588