38 citations · 97 across the 8 of their papers we have counts for
8 papers
Any local Hamiltonian with ferromagnetic quantum many-body scars has a generalized Shiraishi-Mori form
Keita Omiya
Quantum many-body scars (QMBS) are nonthermal eigenstates embedded in otherwise thermal spectra. A broad class of exact QMBS is realized as fixed-momentum magnon states above a fer…
Non-Hermitian Quantum Many-Body Scar Phase
Keita Omiya, Yuya O Nakagawa
We introduce a novel non-equilibrium phase -- the quantum many-body scar (QMBS) phase -- that emerges in non-Hermitian many-body dynamics when scarred wavefunctions are selectively…
Quantum many-body scars as remnants of stable many-body periodic orbits
Keita Omiya
Quantum many-body scars (QMBS) represent a weak ergodicity-breaking phenomenon that defies the common scenario of thermalization in closed quantum systems. They are often regarded…
Fractionalization paves the way to local projector embeddings of quantum many-body scars
Keita Omiya, Markus Müller
Many systems that host exact quantum many-body scars (towers of energy-equidistant low entanglement eigenstates) are governed by a Hamiltonian that splits into a Zeeman term and a…
Computational analysis of chemical reactions using a variational quantum eigensolver algorithm without specifying spin multiplicity
Soichi Shirai, Hokuto Iwakiri, Keita Kanno +4
The analysis of a chemical reaction along the ground state potential energy surface in conjunction with an unknown spin state is challenging because electronic states must be separ…
Quantum many-body scars in bipartite Rydberg arrays originate from hidden projector embedding
Keita Omiya, Markus Müller
We study the nature of the ergodicity-breaking "quantum many-body scar" states that appear in the PXP model describing constrained Rabi oscillations. For a {wide class of bipartite…
Molecular Structure Optimization based on Electrons-Nuclei Quantum Dynamics Computation
Hirotoshi Hirai, Takahiro Horiba, Soichi Shirai +4
A new concept of the molecular structure optimization method based on quantum dynamics computations is presented. Nuclei are treated as quantum mechanical particles, as are electro…
Analytical energy gradient for state-averaged orbital-optimized variational quantum eigensolvers and its application to a photochemical reaction
Keita Omiya, Yuya O. Nakagawa, Sho Koh +3
Elucidating photochemical reactions is vital to understand various biochemical phenomena and develop functional materials such as artificial photosynthesis and organic solar cells,…