Multipartite Entanglement versus Multiparticle Entanglement

• URL: http://arxiv.org/abs/2407.13348v1
• Date: Thu, 18 Jul 2024 09:49:09 GMT
• Title: Multipartite Entanglement versus Multiparticle Entanglement
• Authors: Marcin Wieśniak,
• Abstract summary: Entanglement is presence of quantum correlations beyond those achieved by local action and classical communication. A natural extension is a genuine multipartite entanglement (GME), understood as nonexistenence of a decomposition into biseparable states.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Entanglement is defined as presence of quantum correlations beyond those achieved by local action and classical communication. To identify its presence in a generic state, one can, for example, check for existence of a decomposition of separable states. A natural extension is a genuine multipartite entanglement (GME), understood as nonexistenence of a decomposition into biseparable states (later called biseparable decomposition, BD). In this contribution we revisit activation of GME. We discuss few examples of states, which are decomposable into a mixture of biproduct states. However, after merging two copies of these states, we certify nonexistence of BD with witness operators. This seems to challenge our understanding of GME as a separate resource. It turns out that it requires a careful consideration of the physical context. We stress that activation of GME from multiple copies of GME-free states necessarily involves entangling operations.

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