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Experimental Verification of Multicopy Activation of Genuine Multipartite Entanglement

Robert Stárek1,*, Tim Gollerthan2, Olga Leskovjanová1, Michael Meth2, Peter Tirler2, Nicolai Friis3, Martin Ringbauer2, and Ladislav Mišta, Jr.1,†

  • *Contact author: starek@optics.upol.cz
  • †Contact author: mista@optics.upol.cz
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Phys. Rev. Lett. 136, 160201 – Published 20 April, 2026

DOI: https://doi.org/10.1103/kv4s-tfc6

Abstract

A central concept in quantum information processing is genuine multipartite entanglement (GME), a type of correlation beyond biseparability, that is, correlations that cannot be explained by statistical mixtures of partially separable states. GME is relevant for characterizing and benchmarking complex quantum systems, and it is an important resource for applications such as quantum communication. Remarkably, it has been found that GME can be activated from multiple copies of biseparable quantum states, which do not possess GME individually. Here, we experimentally demonstrate unambiguous evidence of such GME activation from two copies of a biseparable three-qubit state in a trapped-ion quantum processor. These results not only challenge notions of quantum resources but also highlight the potential of using multiple copies of quantum states to achieve tasks beyond the capabilities of the individual copies.

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Phys. Rev. Lett. 136, 160201– Published 20 April, 2026
  • Received 21 October 2025
  • Accepted 27 February 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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