Article
Optics
Massimiliano F. Sacchi
Summary: This study examines energetic exchanges and fluctuations in two-stroke quantum thermodynamic engines with multilevel quantum systems as the working fluid, differentiating between three modes of operation, and exploring thermodynamic uncertainty relations between entropy production and signal-to-noise ratio. The research bridges the gap between two-qubit and two-mode bosonic swap engines, highlighting maintained and lost properties as dimension increases.
Article
Physics, Fluids & Plasmas
Massimiliano F. Sacchi
Summary: In this study, we investigate two-mode bosonic engines undergoing an Otto cycle. Energy exchange between the two bosonic systems is facilitated by a tunable unitary bilinear interaction, while cyclic operation is achieved by relaxation to different-temperature baths. Using a two-point measurement approach, we determined the joint probability of stochastic work and heat, and derived exact expressions for work and heat fluctuations, revealing interdependencies among average extracted work, fluctuations, and efficiency. Additionally, thermodynamic uncertainty relations were established between the signal-to-noise ratio of observed work and heat and entropy production.
Review
Physics, Multidisciplinary
Viktor Holubec, Artem Ryabov
Summary: The study of fluctuations in the performance of small heat engines has gained attention due to the development of microscopic machines. Understanding these fluctuations may lead to a revolution similar to the discovery of the second law of thermodynamics.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Physics, Multidisciplinary
Tobias Denzler, Eric Lutz
Summary: The efficiency of small thermal machines is typically a fluctuating quantity. We analytically computed the joint characteristic functions for heat and work of two exemplary quantum heat engines, and found that work and heat are perfectly anticorrelated for generic scale-invariant quantum heat engines under adiabatic driving.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Fluids & Plasmas
Trevor GrandPre, Katherine Klymko, Kranthi K. Mandadapu, David T. Limmer
Summary: The study establishes a general lower bound on entropy production in interacting active matter systems, revealing a relationship between entropy and phase transitions in active matter models. It also explores factors affecting collective fluctuations and long-ranged correlations, shedding light on the dynamics of enhanced fluctuations and control mechanisms within the system.
Article
Physics, Multidisciplinary
Pablo A. Morales, Jan Korbel, Fernando E. Rosas
Summary: The recent discovery of a link between generalized Legendre transforms and non-dually flat statistical manifolds reveals the fundamental reason for the prevalence of Renyi's divergence and entropy in various physical phenomena. However, the nature of this relationship and its implications for physical systems are still not well-understood. This study sheds new light on the Legendre transform by exploring its deformation through symplectic geometry and complexification, providing a unified and principled understanding of physical systems that are not well-described by traditional information-theoretic quantities.
Article
Physics, Multidisciplinary
Masamichi Ishihara
Summary: We studied the relation between escort averages in microcanonical and canonical ensembles in Tsallis statistics. We derived a condition relating the heat capacity C-V(CE) and the entropic parameter q. We also calculated the energy, energy fluctuation, and the difference between the two ensembles.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Physics, Fluids & Plasmas
Karlo de Leon, Ian Vega
Summary: This paper examines the applicability of Ruppeiner geometry in constructing phase boundaries and Widom line of more general fluids. The results show that the Ruppeiner geometric construction is equivalent to the standard Maxwell construction near the critical point for phase boundaries. However, the usual prescription based on the Ruppeiner geometry does not produce the expected Widom line for arbitrary cases of the general fluid equation of state. By using a different hypersurface called the Ruppeiner-N surface and its associated induced metric, the Ruppeiner construction can generate the entire Widom line of the van der Waals fluid accurately, even away from the critical point. Additionally, this alternative hypersurface improves the classification scheme for partitioning the van der Waals state space.
Article
Physics, Multidisciplinary
Harry J. D. Miller, M. Hamed Mohammady, Marti Perarnau-Llobet, Giacomo Guarnieri
Summary: Thermodynamic uncertainty relations reveal the trade-off between precision and entropy production, setting an upper bound for the efficiency of autonomous heat engines. Heat engines operating in the periodic slow-driving regime can satisfy a less restrictive uncertainty relation, allowing for finite power production with small fluctuations while operating close to reversibility. The inclusion of quantum fluctuations reduces engine efficiency relative to average power and reliability.
PHYSICAL REVIEW LETTERS
(2021)
Article
Computer Science, Software Engineering
Laszlo Szirmay-Kalos, Milan Magdics
Summary: Curved spaces are difficult for our eyes trained in Euclidean geometry, but games provide an interesting way to explore them. This paper addresses the adaptation of 3D game engines to curved spaces and identifies areas where modifications are needed.
Article
Physics, Multidisciplinary
Ivan R. Kennedy, Migdat Hodzic
Summary: Despite the success of Carnot's heat engine cycle in establishing thermodynamics, misconceptions about his use of the caloric theory still persist, restricting his legacy. A revision of the Carnot cycle can correct this by showing that heat flow is internally compensated with configurational changes in the thermodynamic potential of the working fluid. Action is a scalar property related to angular momentum, with entropy being a logarithmic function of relative action ratios in atmospheric gases.
Article
Physics, Fluids & Plasmas
Domingos S. P. Salazar
Summary: Fluctuation theorems set fundamental limits on the statistics of entropy production, with the information quantification and upper bound determined by the maximal distribution. This bound is verified in various scenarios, including heat transfer and qubit swap engines, showcasing the versatility of the theory.
Article
Physics, Multidisciplinary
Adrian-Josue Guel-Cortez, Eun-jin Kim
Summary: The research investigates the prediction capability of information theory in detecting and measuring abrupt changes in a system. It finds that information length diagnostics outperforms information flow in predicting sudden events, and reveals limitations of information flow in measuring perturbations that do not affect entropy.
Article
Physics, Multidisciplinary
Eun-jin Kim, Adrian-Josue Guel-Cortez
Summary: Information processing in complex systems is common and can be elucidated using information geometric theory. This paper introduces a new information-geometric measure of causality by calculating the effect of one variable on the information rate of the other variable, which proves to be a sensitive method for identifying causal relations.
Article
Multidisciplinary Sciences
Miguel Aguilera, S. Amin Moosavi, Hideaki Shimazaki
Summary: Many mean-field theories are proposed for studying the non-equilibrium dynamics of complex systems, with each based on specific assumptions about the system's temporal evolution. Here, Aguilera et al. propose a unified framework for mean-field theories of asymmetric kinetic Ising systems to study non-equilibrium dynamics.
NATURE COMMUNICATIONS
(2021)
Article
Mechanics
Andreas Dechant, Shin-ichi Sasa
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2018)
Article
Physics, Multidisciplinary
Andreas Dechant, Farina Kindermann, Artur Widera, Eric Lutz
PHYSICAL REVIEW LETTERS
(2019)
Article
Multidisciplinary Sciences
Andreas Dechant, Shin-ichi Sasa
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Physics, Multidisciplinary
Sosuke Ito, Andreas Dechant
Article
Chemistry, Physical
Andreas Dechant, Tatsuhiko Ohto, Yoshikazu Ito, Marina Makarova, Yusuke Kawabe, Tatsufumi Agari, Hikaru Kumai, Yasufumi Takahashi, Hisashi Naito, Motoko Kotani
Summary: The geometric structures of carbon networks play a crucial role in designing material properties. A mathematical model based on discrete geometric analysis has been proposed to describe these features and their relationships to material properties, with candidates pre-screened for novel material design. Preferential dopant incorporation at local curved sites enhanced catalytic activity in the designed carbon network.
Article
Physics, Multidisciplinary
Andreas Dechant
Summary: In this study, we investigate the problem of minimizing the entropy production for a physical process described by Markov jump dynamics. We find that, without any additional constraints, a given time-evolution can be realized with arbitrarily small entropy production at the expense of diverging activity. However, when the activity is fixed, the dynamics that minimizes the entropy production is driven by conservative forces. Moreover, we express the value of the minimum entropy production in terms of the graph-distance based Wasserstein distance between the initial and final configuration, which introduces a new type of speed limit relating dissipation, the average number of transitions, and the Wasserstein distance. We also demonstrate our findings using simple state networks, a time-dependent pump, and spin flips in the Ising model.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Physics, Multidisciplinary
Andreas Dechant, Shin-ichi Sasa
Summary: The paper discusses how to use correlations between different physical observables to improve thermodynamics bounds, showing that increasing the number of measured observables will always produce a tighter bound. The tighter bound becomes particularly useful if one of the observables is a conserved quantity.
Article
Physics, Fluids & Plasmas
Andreas Dechant, Shin-ichi Sasa, Sosuke Ito
Summary: This study investigates a generic overdamped Langevin dynamics under the influence of both time-dependent and non-conservative forces. The entropy production rate is decomposed into excess entropy, housekeeping entropy, and coupling part, which characterizes the interaction between the time-dependent and nonconservative forces. The study also derives thermodynamic uncertainty relations for the excess and housekeeping entropy and shows that all quantities obey integral fluctuation theorems.
Article
Physics, Multidisciplinary
Andreas Dechant, Shin-ichi Sasa, Sosuke Ito
Summary: This article investigates two qualitatively different ways of driving a physical system out of equilibrium and proposes a new approach to analyze the entropy production and currents in the system. The method is demonstrated by calculating the entropy of a particle in a time-dependent potential.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Andreas Dechant, Shin-ichi Sasa
Summary: In this work, a continuous time-reversal operation is introduced to connect the time-forward and time-reversed trajectories in the steady state of an irreversible Markovian dynamics through a continuous family of stochastic dynamics. This enables a tighter version of the thermodynamic uncertainty relation (TUR) involving observables evaluated relative to their local mean value. Furthermore, a family of dynamics realizing the continuous time reversal contains an equilibrium dynamics midway between the time-forward and time-reversed dynamics. By leveraging this equilibrium dynamics and an appropriate choice of observable, the inequality in the TUR can be turned into an equality, as demonstrated in the example of a particle diffusing in a tilted periodic potential.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Fluids & Plasmas
Shun Otsubo, Sosuke Ito, Andreas Dechant, Takahiro Sagawa
Article
Physics, Multidisciplinary
Andreas Dechant
Article
Physics, Fluids & Plasmas
Andreas Dechant, Shin-ichi Sasa
Article
Physics, Fluids & Plasmas
Dominic Arold, Andreas Dechant, Eric Lutz