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Quantum entanglement in quasi-one-dimensional spin systems with alternating interactions

Author

Listed:
  • Hu, Lizhen
  • Xu, Yuliang
  • Zhang, Panpan
  • Kong, Xiangmu
  • Yan, Shiwei

Abstract

In this study, we systematically investigate bipartite quantum entanglement in quasi-one-dimensional Heisenberg systems, including alternating-interaction spin chains and ladders, using the density matrix renormalization group method. The pairwise entanglement quantified by concurrence is mainly investigated, and the effects of alternating interactions, frustrations and open boundary conditions (OBC) on them are discussed in detail. For Heisenberg chains, the introduction of second- and third-nearest-neighbor interactions induces a redistribution of entanglement. Notably, the ground state exhibits enhanced robustness in long-distance entanglement (LDE) compared to conventional single chains. In the spin ladder systems, LDE is suppressed when rung or diagonal chain couplings are introduced individually, but their coexistence enhances LDE, with an optimal ratio of rung to diagonal couplings of 1:1.3.

Suggested Citation

  • Hu, Lizhen & Xu, Yuliang & Zhang, Panpan & Kong, Xiangmu & Yan, Shiwei, 2026. "Quantum entanglement in quasi-one-dimensional spin systems with alternating interactions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 686(C).
    • Handle: RePEc:eee:phsmap:v:686:y:2026:i:c:s037843712600052x
    DOI: 10.1016/j.physa.2026.131316
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