Separable ellipsoids around multipartite states
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| Format: | Preprint |
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2024
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| _version_ | 1866911080421261312 |
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| author | Wen, Robin Y. Parez, Gilles Lyu, Liuke Witczak-Krempa, William Kempf, Achim |
| author_facet | Wen, Robin Y. Parez, Gilles Lyu, Liuke Witczak-Krempa, William Kempf, Achim |
| contents | We show that, in finite dimensions, around any $m$-partite product state $ρ_{\rm prod}=ρ_1\otimes...\otimesρ_m$, there exists an ellipsoid of separable states centered around $ρ_{\rm prod}$. This separable ellipsoid contains the separable ball proposed in previous works, and the volume of the ellipsoid is typically exponentially larger than that of the ball, due to the hierarchy of eigenvalues in typical states. We further generalize this ellipsoidal criterion to a trace formula that yields separable region around all separable states, and further study biseparability. Our criteria not only help numerical procedures to rigorously detect separability, but they also lead to a nested hierarchy of SLOCC-stable subsets that cover the separable set. We apply the procedure for separability detection to 3-qubit X states, genuinely entangled 4-qubit states mixed with noise, and the 1d transverse field Ising model at finite temperature to illustrate the power of our procedure for understanding entanglement in physical systems. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_05400 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Separable ellipsoids around multipartite states Wen, Robin Y. Parez, Gilles Lyu, Liuke Witczak-Krempa, William Kempf, Achim Quantum Physics Statistical Mechanics Strongly Correlated Electrons Mathematical Physics We show that, in finite dimensions, around any $m$-partite product state $ρ_{\rm prod}=ρ_1\otimes...\otimesρ_m$, there exists an ellipsoid of separable states centered around $ρ_{\rm prod}$. This separable ellipsoid contains the separable ball proposed in previous works, and the volume of the ellipsoid is typically exponentially larger than that of the ball, due to the hierarchy of eigenvalues in typical states. We further generalize this ellipsoidal criterion to a trace formula that yields separable region around all separable states, and further study biseparability. Our criteria not only help numerical procedures to rigorously detect separability, but they also lead to a nested hierarchy of SLOCC-stable subsets that cover the separable set. We apply the procedure for separability detection to 3-qubit X states, genuinely entangled 4-qubit states mixed with noise, and the 1d transverse field Ising model at finite temperature to illustrate the power of our procedure for understanding entanglement in physical systems. |
| title | Separable ellipsoids around multipartite states |
| topic | Quantum Physics Statistical Mechanics Strongly Correlated Electrons Mathematical Physics |
| url | https://arxiv.org/abs/2410.05400 |