95 citations · 629 across the 25 of their papers we have counts for
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Visualization of Entanglement Geometry by Structural Optimization of Tree Tensor Network
Toshiya Hikihara, Hiroshi Ueda, Kouichi Okunishi +2
In tensor-network analysis of quantum many-body systems, it is of crucial importance to employ a tensor network with a spatial structure suitable for representing the state of inte…
Automatic structural optimization of tree tensor networks
Toshiya Hikihara, Hiroshi Ueda, Kouichi Okunishi +2
Tree tensor network (TTN) provides an essential theoretical framework for the practical simulation of quantum many-body systems, where the network structure defined by the connecti…
Angular-time evolution for the Affleck-Kennedy-Lieb-Tasaki chain and its edge-state dynamics
Koutaro Nakajima, Kouichi Okunishi
We study the angular-time evolution that is a parameter-time evolution defined by the entanglement Hamiltonian for the bipartitioned ground state of the Affleck-Kennedy-Lieb-Tasaki…
Developments in the Tensor Network -- from Statistical Mechanics to Quantum Entanglement
Kouichi Okunishi, Tomotoshi Nishino, Hiroshi Ueda
Tensor networks (TNs) have become one of the most essential building blocks for various fields of theoretical physics such as condensed matter theory, statistical mechanics, quantu…
Corner transfer matrix renormalization group analysis of the two-dimensional dodecahedron model
Hiroshi Ueda, Kouichi Okunishi, Seiji Yunoki +1
We investigate the phase transition of the dodecahedron model on the square lattice. The model is a discrete analogue of the classical Heisenberg model, which has continuous …
Finite- scaling analysis of Berezinskii-Kosterlitz-Thouless phase transitions and entanglement spectrum for the six-state clock model
Hiroshi Ueda, Kouichi Okunishi, Kenji Harada +4
We investigate the Berezinskii-Kosterlitz-Thouless transitions for the square-lattice six-state clock model with the corner-transfer matrix renormalization group (CTMRG). Scaling a…