2.2k citations · 9k across the 127 of their papers we have counts for
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Open quantum spin chains with non-reciprocity: a theoretical approach based on the time-dependent generalized Gibbs ensemble
Alice Marché, Hironobu Yoshida, Alberto Nardin +2
We study an open quantum spin chain with non-reciprocal dissipation using a theoretical approach known as time-dependent generalized Gibbs ensemble. In the regime of weak dissipati…
More global randomness from less-random local gates
Ryotaro Suzuki, Hosho Katsura, Yosuke Mitsuhashi +3
Random circuits giving rise to unitary designs are key tools in quantum information science and many-body physics. In this work, we investigate a class of random quantum circuits w…
Quantum transport on Bethe lattices with non-Hermitian sources and a drain
Naomichi Hatano, Hosho Katsura, Kohei Kawabata
We consider quantum transport in a tight-binding model on the Bethe lattice of finite generation, which we expect to be the first step toward analyzing electronic transport in a li…
Jordan Decomposition of Non-Hermitian Fermionic Quadratic Forms
Shunta Kitahama, Hironobu Yoshida, Ryo Toyota +1
We give a rigorous proof of Conjecture 3.1 by Prosen [Prosen T 2010 J. Stat. Mech. P07020] on the nilpotent part of the Jordan decomposition of a quadratic fermioni…
Quantum many-body scars of spinless fermions with density-assisted hopping in higher dimensions
Kensuke Tamura, Hosho Katsura
We introduce a class of spinless fermion models that exhibit quantum many-body scars (QMBS) originating from kinetic constraints in the form of density-assisted hopping. The models…
Onsager's Scars in Disordered Spin Chains
Naoyuki Shibata, Nobuyuki Yoshioka, Hosho Katsura
We propose a class of non-integrable quantum spin chain models that exhibit quantum many-body scars even in the presence of disorder. With the use of the so-called Onsager symmetry…
Simulating quantum circuits by adiabatic computation: improved spectral gap bounds
Shane Dooley, Graham Kells, Hosho Katsura +1
Adiabatic quantum computing is a framework for quantum computing that is superficially very different to the standard circuit model. However, it can be shown that the two models ar…
Notes on Inhomogeneous Quantum Walks
Yutaka Shikano, Hosho Katsura
We study a class of discrete-time quantum walks with inhomogeneous coins defined in [Y. Shikano and H. Katsura, Phys. Rev. E {\bf 82}, 031122 (2010)]. We establish symmetry propert…
Localization and Fractality in Inhomogeneous Quantum Walks with Self-Duality
Yutaka Shikano, Hosho Katsura
We introduce and study a class of discrete-time quantum walks on a one-dimensional lattice. In contrast to the standard homogeneous quantum walks, coin operators are inhomogeneous…
Entanglement in valence-bond-solid states on symmetric graphs
Hosho Katsura, Naoki Kawashima, Anatol N. Kirillov +2
We study quantum entanglement in the ground state of the Affleck-Kennedy-Lieb-Tasaki (AKLT) model defined on two-dimensional graphs with reflection and/or inversion symmetry. The g…
Block Spin Density Matrix of the Inhomogeneous AKLT Model
Ying Xu, Hosho Katsura, Takaaki Hirano +1
We study the inhomogeneous generalization of a 1-dimensional AKLT spin chain model. Spins at each lattice site could be different. Under certain conditions, the ground state of thi…
Entanglement and Density Matrix of a Block of Spins in AKLT Model
Ying Xu, Hosho Katsura, Takaaki Hirano +1
We study a 1-dimensional AKLT spin chain, consisting of spins in the bulk and at both ends. The unique ground state of this AKLT model is described by the Valence-Bond-So…
Entanglement in an SU(n) Valence-Bond-Solid State
Hosho Katsura, Takaaki Hirano, Vladimir E. Korepin
We investigate entanglement properties in the ground state of the open/periodic SU() generalized valence-bond-solid state consisting of representations of SU(). We obtain exa…
Quantum cloning with nonlocal assistance: Complement of Jozsa's stronger no-cloning theorem
Koji Azuma, Masato Koashi, Hosho Katsura +1
We investigate the cases where a set of states cannot be cloned by itself, but is clonable with the help of another system prepared in state . When $S…
Exact supersymmetry in the relativistic hydrogen atom in general dimensions -- supercharge and the generalized Johnson-Lippmann operator
Hosho Katsura, Hideo Aoki
A Dirac particle in general dimensions moving in a 1/r potential is shown to have an exact N = 2 supersymmetry, for which the two supercharge operators are obtained in terms of (a…