254 citations · 488 across the 23 of their papers we have counts for
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Speed limits to fluctuation dynamics
Ryusuke Hamazaki
Fluctuation dynamics of an experimentally measured observable offer a primary signal for nonequilibrium systems, along with dynamics of the mean. While universal speed limits for t…
Absorption to Fluctuating Bunching States in Non-Unitary Boson Dynamics
Ken Mochizuki, Ryusuke Hamazaki
We show that noisy nonunitary dynamics of bosons drives arbitrary initial states into a novel fluctuating bunching state, where all bosons occupy one time-dependent mode. We propos…
Violation of Eigenstate Thermalization Hypothesis in Quantum Field Theories with Higher-Form Symmetry
Osamu Fukushima, Ryusuke Hamazaki
We elucidate how the presence of higher-form symmetries affects the dynamics of thermalization in isolated quantum systems. Under reasonable assumptions, we analytically show that…
Quantum Velocity Limits for Multiple Observables: Conservation Laws, Correlations, and Macroscopic Systems
Ryusuke Hamazaki
How multiple observables mutually influence their dynamics has been a crucial issue in statistical mechanics. We introduce a new concept, "quantum velocity limits," to establish a…
Bounds on eigenstate thermalization
Shoki Sugimoto, Ryusuke Hamazaki, Masahito Ueda
The eigenstate thermalization hypothesis (ETH), which asserts that every eigenstate of a many-body quantum system is indistinguishable from a thermal ensemble, plays a pivotal role…