320 citations · 2k across the 37 of their papers we have counts for
40 papers
Optimal asymptotic pure-state conversion under thermal operations
Tatsuya Yamanouchi, Naoto Shiraishi
Quantum thermodynamics seeks to characterize possible state transformations under thermodynamic constraints in microscopic quantum systems. In the fully quantum regime, however, qu…
Frustration-freeness is decidable but unprovable
Naoto Shiraishi
The frustration-free property is valuable in quantum many-body systems, which states that its ground states simultaneously minimize all local interaction terms, even when these ter…
Second largest eigenvalue does not bound stationary entropy production
Naoto Shiraishi
We examine the spectral dissipation-coherence trade-off inequality conjectured by Oberreiter {\it et al}. [Phys. Rev. E 106, 014106 (2022)], stating that the coherent number, defin…
Arbitrary Amplification of Quantum Coherence in Asymptotic and Catalytic Transformation
Naoto Shiraishi, Ryuji Takagi
Quantum coherence is one of the fundamental aspects distinguishing classical and quantum theories. Coherence between different energy eigenstates is particularly important, as it s…
Proof of avoidability of the quantum first-order transition in transverse magnetization in quantum annealing of finite-dimensional spin glasses
Mizuki Sanatani, Naoto Shiraishi, Koji Hukushima
It is rigorously shown that an appropriate quantum annealing for any finite-dimensional spin system has no quantum first-order transition in transverse magnetization. This result c…
Entropy production limits all fluctuation oscillations
Naoto Shiraishi
The oscillation of fluctuation with two state observables is investigated. Following the idea of Ohga, et al. [arXiv:2303.13116], we find that the fluctuation oscillation relative…
Fluctuation-response relation of time-symmetric quantities around general nonequilibrium stationary state
Naoto Shiraishi
A connection between the response and fluctuation in general nonequilibrium stationary states is investigated. We focus on time-symmetric quantities and find that the fluctuation o…
Is there any upper bound on current fluctuation in cross-transport beyond linear response regime?
Naoto Shiraishi, Tan Van Vu, Keiji Saito
Input and output current fluctuations in stationary cross-transport systems with two kinds of currents are investigated. In Saryal {\it et al.} [Phys. Rev. Lett. 127, 190603 (2021)…
Time-symmetric current and its fluctuation response relation around nonequilibrium stalling stationary state
Naoto Shiraishi
We propose a time-symmetric counterpart of the current in stochastic thermodynamics named time-symmetric current. This quantity is defined with empirical measures and thus is symme…
Optimal thermodynamic uncertainty relation in Markov jump processes
Naoto Shiraishi
We investigate the tightness and optimality of thermodynamic-uncertainty-relation (TUR)-type inequalities from two aspects, the choice of the Fisher information and the class of po…
Correlation in Catalysts Enables Arbitrary Manipulation of Quantum Coherence
Ryuji Takagi, Naoto Shiraishi
Quantum resource manipulation may include an ancillary state called a catalyst, which aids the transformation while restoring its original form at the end, and characterizing the e…
Undecidability of the fate of relaxation in one-dimensional quantum systems
Naoto Shiraishi, Keiji Matsumoto
We investigate the relaxation dynamics in an isolated quantum many-body system. The stationary value of an observable after relaxation is a topic of researches in the field of quan…
Undecidability in quantum thermalization
Naoto Shiraishi, Keiji Matsumoto
The investigation of thermalization in isolated quantum many-body systems has a long history, dating back to the time of developing statistical mechanics. Most quantum many-body sy…
Quantum thermodynamics of correlated-catalytic state conversion at small-scale
Naoto Shiraishi, Takahiro Sagawa
The class of possible thermodynamic conversions can be extended by introducing an auxiliary system called catalyst, which assists state conversion while remaining its own state unc…
Two constructive proofs on d-majorization and thermo-majorization
Naoto Shiraishi
Two constructive proofs on d-majorization and thermo-majorization are provided. In the first part, we present a diagrammatic proof of the equivalence between d-majorization and the…
Speed limit for open systems coupled to general environments
Naoto Shiraishi, Keiji Saito
In this study, we investigate the bound on the speed of state transformation in the quantum and classical systems that are coupled to general environment with arbitrary coupling in…
Coherence cost for violating conservation laws
Hiroyasu Tajima, Naoto Shiraishi, Keiji Saito
Nature imposes many restrictions on the operations that we perform. Many of these restrictions can be interpreted in terms of {\it resource} required to realize the operations. Cla…
Connection between quantum-many-body scars and the AKLT model from the viewpoint of embedded Hamiltonians
Naoto Shiraishi
We elucidate the deep connection between the PXP model, which is a standard model of quantum many-body scars, and the AKLT Hamiltonian. Using the framework of embedded Hamiltonians…
Information-theoretical bound of the irreversibility in thermal relaxation processes
Naoto Shiraishi, Keiji Saito
We establish that entropy production, which is crucial to the characterization of thermodynamic irreversibility, is obtained through a variational principle involving the Kulback-L…
Speed limit for open quantum systems
Ken Funo, Naoto Shiraishi, Keiji Saito
We study the quantum speed limit for open quantum systems described by the Lindblad master equation. The obtained inequality shows a trade-off relation between the operation time a…
Constructing Concrete Hard Instances of the Maximum Independent Set Problem
Naoto Shiraishi, Jun Takahashi
We provide a deterministic construction of hard instances for the maximum independent set problem (MIS). The constructed hard instances form an infinite graph sequence with increas…
Fundamental relation between entropy production and heat current
Naoto Shiraishi, Keiji Saito
We investigate the fundamental relation between entropy production rate and the speed of energy exchange between a system and baths in classical Markov processes. We establish the…
Proof of the absence of local conserved quantities in the XYZ chain with a magnetic field
Naoto Shiraishi
We rigorously prove that the spin-1/2 XYZ chain with a magnetic field has no local conserved quantity. Any nontrivial conserved quantity of this model is shown to be a sum of opera…
Speed Limit for Classical Stochastic Processes
Naoto Shiraishi, Ken Funo, Keiji Saito
Speed limit for classical stochastic Markov processes with discrete states is studied. We find that a trade-off inequality exists between the speed of the state transformation and…