114 citations · 206 across the 8 of their papers we have counts for
6 papers · 1 filter
Redesigning the linear--quadratic--Gaussian cost function for feedback cooling of a quantum harmonic oscillator
Shuma Sugiura, Koki Shiraishi, Masahito Ueda
Linear--quadratic--Gaussian (LQG) control is optimal only with respect to a prescribed cost function, the choice of which dictates the physical objective of the control. We conside…
Work Extraction Across a Thermodynamic Hierarchy in Quantum Many-Body Systems
Akihiro Hokkyo, Masahito Ueda
Thermodynamics is operational in the sense that the very concept of thermal equilibrium depends crucially on the choice of observables, while the amount of extractable work is defi…
Tunable many-body burst in isolated quantum systems
Shozo Yamada, Akihiro Hokkyo, Masahito Ueda
Thermalization in isolated quantum many-body systems can be nonmonotonic, with its process dependent on an initial state. We propose a numerical method to construct a low-entangled…
Quantum i.i.d. Steady States in Open Many-Body Systems
Takanao Ishii, Masahito Ueda
Understanding how a quantum many-body state is maintained stably as a nonequilibrium steady state is of fundamental and practical importance for exploration and exploitation of ope…
Quantum feedback cooling of a trapped nanoparticle by using a low-pass filter
Shuma Sugiura, Masahito Ueda
We propose a low-pass-filter (LPF) feedback control for cooling a trapped particle with a low-pass filter, which utilizes a shift of the potential caused by the feedback operation.…
Universal Upper Bound on Ergotropy and No-Go Theorem by the Eigenstate Thermalization Hypothesis
Akihiro Hokkyo, Masahito Ueda
We show that the maximum extractable work (ergotropy) from a quantum many-body system is constrained by local athermality of an initial state and local entropy decrease brought abo…