115 citations · 179 across the 7 of their papers we have counts for
7 papers
A comprehensive survey on quantum computer usage: How many qubits are employed for what purposes?
Tsubasa Ichikawa, Hideaki Hakoshima, Koji Inui +18
Quantum computers (QCs), which work based on the law of quantum mechanics, are expected to be faster than classical computers in several computational tasks such as prime factoring…
Systematic study on the dependence of the warm-start quantum approximate optimization algorithm on approximate solutions
Ken N. Okada, Hirofumi Nishi, Taichi Kosugi +1
Quantum approximate optimization algorithm (QAOA) is a promising hybrid quantum-classical algorithm to solve combinatorial optimization problems in the era of noisy intermediate-sc…
Identification of topological phases using classically-optimized variational quantum eigensolver
Ken N. Okada, Keita Osaki, Kosuke Mitarai +1
Variational quantum eigensolver (VQE) is regarded as a promising candidate of hybrid quantum-classical algorithm for the near-term quantum computers. Meanwhile, VQE is confronted w…
Magnetoelectric effect in band insulator-ferromagnet heterostructures
Ken N. Okada, Yasuyuki Kato, Yukitoshi Motome
We theoretically study magnetoelectric effects in a heterostructure of a generic band insulator and a ferromagnet. In contrast to the kinetic magnetoelectric effect in metals, refe…
Multiple- magnetic orders in Rashba-Dresselhaus metals
Ken N. Okada, Yasuyuki Kato, Yukitoshi Motome
We study magnetic textures realized in noncentrosymmetric Kondo lattice models, in which localized magnetic moments weakly interact with itinerant electrons subject to Rashba and D…
Observation of topological Faraday and Kerr rotations in quantum anomalous Hall state by terahertz magneto-optics
K. N. Okada, Y. Takahashi, M. Mogi +6
Electrodynamic responses from three-dimensional (3D) topological insulators (TIs) are characterized by the universal magnetoelectric term constituent of the Lagrangian f…