10 citations · 28 across the 10 of their papers we have counts for
11 papers
Anisotropic information geometry of entropy production
Tomohiro Nishiyama, Yoshihiko Hasegawa
We reveal that the information geometry of entropy production exhibits an intrinsic anisotropy, providing a unified origin for the inequivalent geometric constraints obeyed by its…
Structural -divergence: Tight universal bounds for cost function moments and gradients in parameterized quantum circuits
Tomohiro Nishiyama, Yoshihiko Hasegawa
The barren plateau phenomenon, in which cost-function gradients of variational quantum algorithms vanish exponentially, remains a central obstacle for near-term quantum computing.…
Unified entropy production in finite quantum systems
Tomohiro Nishiyama, Yoshihiko Hasegawa
In finite-dimensional quantum systems, temperature cannot be uniquely defined. This, in turn, implies that there are several ways to define entropy production in finite-dimensional…
Quantum thermodynamic uncertainty relations without quantum corrections: A coherent-incoherent correspondence approach
Tomohiro Nishiyama, Yoshihiko Hasegawa
We introduce the coherent-incoherent correspondence as a framework for deriving quantum thermodynamic uncertainty relations under continuous measurement in Lindblad dynamics. The c…
Unified speed limits in classical and quantum dynamics via temporal Fisher information
Tomohiro Nishiyama, Yoshihiko Hasegawa
The importance of Fisher information is increasing in nonequilibrium thermodynamics, as it has played a fundamental role in trade-off relations such as thermodynamic uncertainty re…
Thermodynamic entropic uncertainty relation
Yoshihiko Hasegawa, Tomohiro Nishiyama
Thermodynamic uncertainty relations reveal a fundamental trade-off between the precision of a trajectory observable and entropy production, where the uncertainty of the observable…
A unified framework of unitarily residual measures for quantifying dissipation
Tomohiro Nishiyama, Yoshihiko Hasegawa
Open quantum systems are governed by both unitary and non-unitary dynamics, with dissipation arising from the latter. Traditional quantum divergence measures, such as quantum relat…
Speed limits and thermodynamic uncertainty relations for quantum systems governed by non-Hermitian Hamiltonian
Tomohiro Nishiyama, Yoshihiko Hasegawa
Non-Hermitian Hamiltonians play a crucial role in describing open quantum systems and nonequilibrium dynamics. In this paper, we derive trade-off relations for systems governed by…
Thermodynamic concentration inequalities and tradeoff relations
Yoshihiko Hasegawa, Tomohiro Nishiyama
Thermodynamic tradeoff relations quantify the fundamental concept of ``no free lunch'' in the physical world, suggesting that faster and more precise physical processes come at a h…
Tradeoff relations in open quantum dynamics via Robertson, Maccone-Pati, and Robertson-Schrödinger uncertainty relations
Tomohiro Nishiyama, Yoshihiko Hasegawa
The Heisenberg uncertainty relation, together with Robertson's generalisation, serves as a fundamental concept in quantum mechanics, showing that noncommutative pairs of observable…
Exact solution to quantum dynamical activity
Tomohiro Nishiyama, Yoshihiko Hasegawa
The quantum dynamical activity constitutes a thermodynamic cost in trade-off relations such as the quantum speed limit and the quantum thermodynamic uncertainty relation. However,…