Long-range bipartite entanglement in XXZ spin chains with the exponential and power-law long-range interactions
- URL: http://arxiv.org/abs/2503.09169v2
- Date: Mon, 20 Oct 2025 11:50:03 GMT
- Title: Long-range bipartite entanglement in XXZ spin chains with the exponential and power-law long-range interactions
- Authors: Na Li, Yang Zhao, Wen-Long Ma, Z. D. Wang, Yan-Kui Bai,
- Abstract summary: Long-range bipartite entanglement (LBE) and its distribution properties are studied in XXZ spin chains with the exponential and power-law long-range interactions (ELRIs and PLRIs)<n>LBE quantified by two-qubit concurrence decays exponentially along with two-site distance in the infinite chain with ELRIs in the thermodynamic limit.<n>A fine-grained LBE distribution relation is obtained for the infinite XXZ spin chain.
- Score: 6.275653300651416
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Long-range bipartite entanglement (LBE) and its distribution properties are studied in XXZ spin chains with the exponential and power-law long-range interactions (ELRIs and PLRIs). LBE quantified by two-qubit concurrence decays exponentially along with two-site distance in the infinite chain with ELRIs in the thermodynamic limit, and the long-range behavior of two-spin entanglement can detect the quantum phase transition and identify different quantum phases away from the critical point. Moreover, a fine-grained LBE distribution relation is obtained for the infinite XXZ spin chain. On the other hand, in the finite XXZ spin chain with the conventional PLRIs, the long-range concurrence decays algebraically and the total one is no longer monotonic along with the chain length. The total LBE distribution property can exhibit a piecewise function, which has a close relationship with the decaying mode and strength of PLRIs. These LBE relations can be regarded as the generalization of Koashi-Bu\v{z}ek-Imoto bound for the prototypical long-range XXZ model, having potential applications in quantum information processing.
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