12 citations · 42 across the 9 of their papers we have counts for
9 papers
Singular behavior of an entangled state for a one-dimensional quantum spin system
Akira Kawaguchi, Kaoru Shimizu
We studied the entangled state for a one-dimensional antiferromagnetic quantum spin chain in a transverse field. We calculate the ground state using the density matrix reno…
Classical simulation of quantum algorithms using the tensor product representation
A. Kawaguchi, K. Shimizu, Y. Tokura +1
Using the tensor product representation in the density matrix renormalization group, we show that a quantum circuit of Grover's algorithm, which has one-qubit unitary gates, genera…
Quantum Phase Transitions in the One-Dimensional S=1 Spin-Orbital Model: Implications for Cubic Vanadates
Satoshi Miyashita, Akira Kawaguchi, Norio Kawakami +1
We investigate ground-state properties and quantum phase transitions in the one-dimensional S=1 spin-orbital model relevant to cubic vanadates. Using the density matrix renormaliza…
Hole-doping effects on a frustrated spin ladder
Akira Kawaguchi, Akihisa Koga, Kouichi Okunishi +1
Hole-doping effects are investigated on the {\it t-J} ladder model with the linked-tetrahedra structure. We discuss how a metal-insulator transition occurs upon hole doping with pa…
Dynamical Properties of One-Dimensional Multicomponent Quantum Liquids in Metallic Phase
Satoshi Miyashita, Akira Kawaguchi, Norio Kawakami
We investigate low-energy dynamical properties of one-dimensional multicomponent quantum liquids with the short-range interaction as well as the -type long-range interaction.…
First-Order Phase Transitions in Frustrated Spin Systems
Akihisa Koga, Akira Kawaguchi, Kouichi Okunishi +1
We give a short review of our recent works on the first-order quantum phase transitions in frustrated spin chains with orthogonal-dimer structure. When the ratio of the competing a…