Multipartite entanglement

Tripartite entanglement and the GHZ spin model. Left. Tripartition of the boundary. Right. Illustration of the spin model (with boundary conditions and minimal energy configuration) used to evaluate the GHZ content of a random stabilizer tensor network state.

Despite the fundamental importance of quantum entanglement in many-body systems, our understanding is mostly limited to bipartite situations. Indeed, even defining appropriate notions of multipartite entanglement is a significant challenge for general quantum systems. This multipartite entanglement is known as a GHZ state.

A team of scientists at University of Amsterdam has initiated the study of multipartite entanglement in a rich, yet tractable class of quantum states called stabilizer tensor networks. They demonstrated that, for generic stabilizer tensor networks, the geometry of the tensor network informs the multipartite entanglement structure of the state.

The paper has been published in Physical Review Letters.

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