Entanglement entropy by tensor renormalization group approach

2025/02/04 by Takahiro Hayazaki, Daisuke Kadoh, Hayazaki, Takahiro +5
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #Quantum many-body systems

paper · pdf · doi:10.48550/arxiv.2502.02030

openalex publication_date 2025/02/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report on tensor renormalization group calculations of entanglement entropy in one-dimensional quantum systems. The reduced density matrix of a Gibbs state can be represented as a 1 + 1-dimensional tensor network, which is analogous to the tensor network representation of the partition function. The HOTRG method is used to approximate the reduced density matrix for arbitrary subsystem sizes, from which we obtain the entanglement entropy. We test our method in the quantum Ising model and obtain the entanglement entropy of the ground state by taking the size of time direction to infinity. The central charge c is obtained as c = 0.49997(8) for a bond dimension D=96, which agrees with the theoretical value c=1/2 within the error.

Related

• Tensor renormalization group approach to entanglement entropy
• Entanglement and the density matrix renormalisation group in the generalised Landau paradigm
• Entanglement Entropy and The Density Matrix Renormalization Group
• A Classical Model Correspondence for G-symmetric Random Tensor Networks
• Entanglement and Rényi entropies of (1+1)-dimensional O(3) nonlinear sigma model with tensor renormalization group