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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2502.02030 |
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| _version_ | 1866915147780456448 |
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| author | Hayazaki, Takahiro Kadoh, Daisuke Takeda, Shinji Tanaka, Gota |
| author_facet | Hayazaki, Takahiro Kadoh, Daisuke Takeda, Shinji Tanaka, Gota |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_02030 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Entanglement entropy by tensor renormalization group approach Hayazaki, Takahiro Kadoh, Daisuke Takeda, Shinji Tanaka, Gota High Energy Physics - Lattice 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. |
| title | Entanglement entropy by tensor renormalization group approach |
| topic | High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2502.02030 |