On the existence of fully inseparable biseparable Gaussian states
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866914608465313792 |
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| author | Leskovjanová, Olga Baksová, Klára Provazník, Jan Mišta, Jr., Ladislav Friis, Nicolai |
| author_facet | Leskovjanová, Olga Baksová, Klára Provazník, Jan Mišta, Jr., Ladislav Friis, Nicolai |
| contents | Genuine multipartite entanglement and full inseparability are two inequivalent quantum resources. Even though all genuinely multipartite entangled states are also fully inseparable, not all fully inseparable states are genuinely multipartite entangled. There exist fully inseparable states that can be prepared as convex mixtures of states separable with respect to different bipartite splits. Here, we are interested in examples of Gaussian states that possess this type of entanglement, so-called fully inseparable biseparable states. We show for several archetypical families of multimode Gaussian states that fully inseparable biseparable candidate states are actually genuinely multipartite entangled. Using projections to finite-dimensional subspaces and fully decomposable witnesses, we observe a shrinking of the regions of potentially fully inseparable biseparable Gaussian states with growing dimension of the projection subspaces. We therefore conjecture that all fully inseparable Gaussian states are genuinely multipartite entangled. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_28404 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | On the existence of fully inseparable biseparable Gaussian states Leskovjanová, Olga Baksová, Klára Provazník, Jan Mišta, Jr., Ladislav Friis, Nicolai Quantum Physics Genuine multipartite entanglement and full inseparability are two inequivalent quantum resources. Even though all genuinely multipartite entangled states are also fully inseparable, not all fully inseparable states are genuinely multipartite entangled. There exist fully inseparable states that can be prepared as convex mixtures of states separable with respect to different bipartite splits. Here, we are interested in examples of Gaussian states that possess this type of entanglement, so-called fully inseparable biseparable states. We show for several archetypical families of multimode Gaussian states that fully inseparable biseparable candidate states are actually genuinely multipartite entangled. Using projections to finite-dimensional subspaces and fully decomposable witnesses, we observe a shrinking of the regions of potentially fully inseparable biseparable Gaussian states with growing dimension of the projection subspaces. We therefore conjecture that all fully inseparable Gaussian states are genuinely multipartite entangled. |
| title | On the existence of fully inseparable biseparable Gaussian states |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2605.28404 |