Logarithmic growth of peripheral entanglement concentrated via noisy measurements in a star network of spins
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| Format: | Preprint |
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2023
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| _version_ | 1866917469836279808 |
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| author | Krishnan, Jithin G. J., Harikrishnan K. Pal, Amit Kumar |
| author_facet | Krishnan, Jithin G. J., Harikrishnan K. Pal, Amit Kumar |
| contents | In a star-network of qubits interacting via Heisenberg interaction of XYZ-type, we demonstrate a logarithmic growth of the localizable bipartite peripheral entanglement with increasing periphery-size and vanishing xy-anisotropy. This feature disappears when xy-anisotropy becomes non-zero, exhibiting an anisotropy effect, which can be negated by taking the system out of equilibrium by a qubit-local magnetic field. In the large-center and the competing-center limits of the model, the behaviour of LBPE is qualitatively different from that of the large-periphery limit. Also, the bipartite peripheral entanglement computed via a partial trace-based approach behaves qualitatively similarly to the LBPE in the large periphery limit, while in the other two limits, it behaves differently. We further consider the generalized description of localizable entanglement using unsharp measurements, and demonstrate that the logarithmic growth of LBPE is present for all noise strengths in the large-periphery limit, while in the competing-center limit, it does not. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2307_15949 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Logarithmic growth of peripheral entanglement concentrated via noisy measurements in a star network of spins Krishnan, Jithin G. J., Harikrishnan K. Pal, Amit Kumar Quantum Physics Strongly Correlated Electrons In a star-network of qubits interacting via Heisenberg interaction of XYZ-type, we demonstrate a logarithmic growth of the localizable bipartite peripheral entanglement with increasing periphery-size and vanishing xy-anisotropy. This feature disappears when xy-anisotropy becomes non-zero, exhibiting an anisotropy effect, which can be negated by taking the system out of equilibrium by a qubit-local magnetic field. In the large-center and the competing-center limits of the model, the behaviour of LBPE is qualitatively different from that of the large-periphery limit. Also, the bipartite peripheral entanglement computed via a partial trace-based approach behaves qualitatively similarly to the LBPE in the large periphery limit, while in the other two limits, it behaves differently. We further consider the generalized description of localizable entanglement using unsharp measurements, and demonstrate that the logarithmic growth of LBPE is present for all noise strengths in the large-periphery limit, while in the competing-center limit, it does not. |
| title | Logarithmic growth of peripheral entanglement concentrated via noisy measurements in a star network of spins |
| topic | Quantum Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2307.15949 |