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quant-ph2026
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…
quant-ph2026
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…
quant-ph2026
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…