8 citations · 8 across the 1 of their papers we have counts for
11 papers
Lieb-Robinson bound and almost-linear light-cone in interacting boson systems
Tomotaka Kuwahara, Keiji Saito
In this work, we investigate how quickly local perturbations propagate in interacting boson systems with Bose-Hubbard-type Hamiltonians. In general, these systems have unbounded lo…
Absence of fast scrambling in thermodynamically stable long-range interacting systems
Tomotaka Kuwahara, Keiji Saito
In this study, we investigate out-of-time-order correlators (OTOCs) in systems with power-law decaying interactions such as , where is the distance. In such systems, th…
Improved thermal area law and quasi-linear time algorithm for quantum Gibbs states
Tomotaka Kuwahara, Álvaro M. Alhambra, Anurag Anshu
One of the most fundamental problems in quantum many-body physics is the characterization of correlations among thermal states. Of particular relevance is the thermal area law, whi…
Many-body scar state intrinsic to periodically driven system: Rigorous results
Sho Sugiura, Tomotaka Kuwahara, Keiji Saito
The violation of the Floquet version of eigenstate thermalization hypothesis is systematically discussed with realistic Hamiltonians. Our model is based on the PXP type interaction…
Strictly linear light cones in long-range interacting systems of arbitrary dimensions
Tomotaka Kuwahara, Keiji Saito
In locally interacting quantum many-body systems, the velocity of information propagation is finitely bounded and a linear light cone can be defined. Outside the light cone, the am…
Clustering of conditional mutual information for quantum Gibbs states above a threshold temperature
Tomotaka Kuwahara, Kohtaro Kato, Fernando G. S. L. Brandão
We prove that the quantum Gibbs states of spin systems above a certain threshold temperature are approximate quantum Markov networks, meaning that the conditional mutual informatio…