184 citations · 934 across the 51 of their papers we have counts for
7 papers · 1 filter
First-quantized quantum simulation with non-local potentials by matrix-product-state encoding
Kazuki Tsuoka, Taichi Kosugi, Masari Watanabe +2
Quantum simulations based on first-quantized approaches can offer lower space and gate complexities than second-quantized approaches. The gate requirements for these simulations ca…
End-to-End Molecular Dynamics with a Langevin Thermostat on Quantum Circuits
Masari Watanabe, Hirofumi Nishi, Taichi Kosugi +3
We construct a quantum-circuit framework for finite-temperature molecular dynamics in the canonical ensemble (NVT) with a Langevin thermostat, connecting canonical state preparatio…
Koopman--von Neumann Molecular Dynamics for Green--Kubo Transport Coefficients
Masari Watanabe, Hirofumi Nishi, Taichi Kosugi +3
We formulate the Green--Kubo transport coefficients of classical molecular dynamics as a readout problem for quantum algorithms using the Koopman--von Neumann (KvN) representation.…
Overcoming the Matrix-Product-State Encoding Barrier via DMRG-Guided Probabilistic Imaginary-Time Evolution
Masari Watanabe, Hirofumi Nishi, Taichi Kosugi +2
Ground-state preparation is a fundamental task in quantum simulation, because the overlap of the prepared state with the true ground state significantly affects the overall cost of…
Quantum algorithms for density functional theory with minimal readout
Yuansheng Zhao, Hirofumi Nishi, Taichi Kosugi +5
While quantum computers have shown significant promise for electronic structure calculations, their potential to accelerate density functional theory (DFT) calculations remains unc…
Channel-agnostic finite-temperature phase estimation averaged over variable grids: reconstruction of Green's function for dynamical mean-field theory
Taichi Kosugi, Hirofumi Nishi, Keito Kasebayashi +2
For treating correlated electronic systems on quantum computers, we propose a quantum-classical hybrid scheme for dynamical mean-field theory (DMFT). In the quantum part of the sch…
Error-corrected phase estimation averaged over variable grids on a trapped-ion quantum computer: hyperacuity spectra of a CO molecule adsorbed onto -FeC
Taichi Kosugi, Hirofumi Nishi, Keito Kasebayashi +2
Quantum phase estimation (QPE) is an underlying technology for extracting the excitation spectra of many-electron systems, yet its practical use on current hardware is hindered by…