arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2209.04563cond-mat.str-elphysics.chem-ph
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强关联$su(2)$自旋系统的强-弱对偶性的Jordan-Wigner变换研究

Strong-Weak Duality via Jordan-Wigner Transformation: Using Fermionic Methods for Strongly Correlated $su(2)$ Spin Systems

Thomas M. Henderson, Guo P. Chen, Gustavo E. Scuseria

摘要:

Jordan-Wigner变换建立了$su(2)$和费米子代数之间的对偶。我们提出了定性的参数和数值证据,当映射自旋费米子,变换使强相关性较弱,所示的Hartree-Fock近似变换的哈密顿量。这一结果可以合理化的自旋位移项的秩减少时,转化为费米子。相反,费米子到量子比特的映射使得强相关性更强,当使用基于量子比特的量子化器时,它的解决方案变得复杂。弦算子的存在对量子化学方法在经典计算机上的实现提出了挑战,但这些可以使用低计算成本的现有技术来处理。我们对XXZ和J $_1$ -J $_2$海森堡(一维和二维)的原理性证明结果表明,JW变换的费米子哈密顿量在其相图的关键区域降低了复杂性,并为解决具有挑战性的自旋问题提供了更好的起点。

英文摘要:

The Jordan-Wigner transformation establishes a duality between $su(2)$ and fermionic algebras. We present qualitative arguments and numerical evidence that when mapping spins to fermions, the transformation makes strong correlation weaker, as demonstrated by the Hartree-Fock approximation to the transformed Hamiltonian. This result can be rationalized in terms of rank reduction of spin shift terms when transformed to fermions. Conversely, the mapping of fermions to qubits makes strong correlation stronger, complicating its solution when one uses qubit-based correlators. The presence of string operators poses challenges to the implementation of quantum chemistry methods on classical computers, but these can be dealt with using established techniques of low computational cost. Our proof of principle results for XXZ and J$_1$-J$_2$ Heisenberg (in 1D and 2D) indicate that the JW transformed fermionic Hamiltonian has reduced complexity in key regions of their phase diagrams, and provides a better starting point for addressing challenging spin problems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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