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Automatic quantum circuit encoding of a given arbitrary quantum state
Tomonori Shirakawa, Hiroshi Ueda, Seiji Yunoki
We propose a quantum-classical hybrid algorithm to encode a given arbitrarily quantum state onto an optimal quantum circuit with a finite numbe…
Spatial, spin, and charge symmetry projections for a Fermi-Hubbard model on a quantum computer
Kazuhiro Seki, Seiji Yunoki
We propose an extended version of the symmetry-adapted variational-quantum-eigensolver (VQE) and apply it to a two-component Fermi-Hubbard model on a bipartite lattice. In the exte…
QMC study of the chiral Heisenberg Gross-Neveu universality class
Yuichi Otsuka, Kazuhiro Seki, Sandro Sorella +1
We investigate a quantum criticality of an antiferromagnetic phase transition in the Hubbard model on a square lattice with a -wave pairing field by large-scale auxiliary-field…
Quantum spin solver near saturation: QS
Hiroshi Ueda, Seiji Yunoki, Tokuro Shimokawa
We develop a program package named QS [\textipa{kjú:-és-kjú:b}] based on the (thick-restart) Lanczos method for analyzing spin-1/2 XXZ-type quantum spin models on spatially u…
Unified description of cuprate superconductors using four-band - model
Hiroshi Watanabe, Tomonori Shirakawa, Kazuhiro Seki +4
In the 35 years since the discovery of cuprate superconductors, we have not yet reached a unified understanding of their properties, including their material dependence of the supe…
Higher-Order Topological Mott Insulator on the Pyrochlore Lattice
Yuichi Otsuka, Tsuneya Yoshida, Koji Kudo +2
We provide the first unbiased evidence for a higher-order topological Mott insulator in three dimensions by numerically exact quantum Monte Carlo simulations. This insulating phase…
Emergent long-range interaction and state-selective localization in a strongly driven model
Kentaro Sugimoto, Seiji Yunoki
The nonlinear effect of a driving force in periodically driven quantum many-body systems can be systematically investigated by analyzing the effective Floquet Hamiltonian. In parti…
Spin-charge conversion and current vortex in spin-orbit coupled systems
Junji Fujimoto, Florian Lange, Satoshi Ejima +4
Using response theory, we calculate the charge-current vortex generated by spin pumping at a point-like contact in a system with Rashba spin-orbit coupling. We discuss the spatial…