Catalytic advantage in Otto-like two-stroke quantum engines

• URL: http://arxiv.org/abs/2401.15173v1
• Date: Fri, 26 Jan 2024 19:36:15 GMT
• Title: Catalytic advantage in Otto-like two-stroke quantum engines
• Authors: Marcin {\L}obejko, Tanmoy Biswas, Pawe{\l} Mazurek and Micha{\l} Horodecki
• Abstract summary: We demonstrate how to incorporate a catalyst to enhance the performance of a heat engine. We analyze efficiency in one of the simplest engines models, which operates in only two strokes.
• Score: 3.072340427031969
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We demonstrate how to incorporate a catalyst to enhance the performance of a heat engine. Specifically, we analyze efficiency in one of the simplest engines models, which operates in only two strokes and comprises of a pair of two-level systems, potentially assisted by a $d$-dimensional catalyst. When no catalysis is present, the efficiency of the machine is given by the Otto efficiency. Introducing the catalyst allows for constructing a protocol which overcomes this bound, while new efficiency can be expressed in a simple form as a generalization of Otto's formula: $1 - \frac{1}{d} \frac{\omega_c}{\omega_h}$. The catalyst also provides a bigger operational range of parameters in which the machine works as an engine. Although an increase in engine efficiency is mostly accompanied by a decrease in work production (approaching zero as the system approaches Carnot efficiency), it can lead to a more favorable trade-off between work and efficiency. The provided example introduces new possibilities for enhancing performance of thermal machines through finite-dimensional ancillary systems.

Related papers

• A finite-time quantum Otto engine with tunnel coupled one-dimensional Bose gases [0.0]
  We study a finite-time quantum Otto engine cycle driven by inter-particle interactions in a weakly interacting Bose gas. We find that, unlike a uniform 1D Bose gas, a harmonically trapped quasicondensate cannot operate purely as a emphheat engine.
  arXiv  Detail & Related papers  (2024-04-25T09:54:21Z)
• Catalytic enhancement in the performance of the microscopic two-stroke heat engine [0.0]
  We consider a model of heat engine operating in the microscopic regime: the twostroke engine. It produces work and exchanges heat in two discrete strokes that are separated in time. An auxiliary non-equilibrium system called catalyst may be incorporated with the working body of the engine.
  arXiv  Detail & Related papers  (2024-02-16T00:27:34Z)
• A Quantum Otto Engine with Shortcuts to Thermalization and Adiabaticity [0.0]
  We investigate the energetic advantage of accelerating an Otto engine by use of shortcuts to adiabaticity and to equilibrium. Applying both type of shortcuts leads to enhanced power and efficiency even after the driving costs are taken into account. We show that controlling three strokes of the cycle leads to an overall improvement of the performance metrics compared with controlling only the two adiabatic strokes.
  arXiv  Detail & Related papers  (2023-06-26T16:59:59Z)
• Improving Performance of Quantum Heat Engines using modified Otto cycle [0.6554326244334868]
  We modify one of the unitary strokes of the cycle by allowing the system to evolve freely with a particular Hamiltonian till a time. This will help in increasing the magnitude of the heat absorbed from the hot bath so that the work output and efficiency of the engine can be increased.
  arXiv  Detail & Related papers  (2023-02-14T12:18:53Z)
• Efficiency at maximum power of a Carnot quantum information engine [68.8204255655161]
  We introduce a finite-time Carnot cycle for a quantum information engine and optimize its power output in the regime of low dissipation. We investigate the optimal performance of a qubit information engine subjected to weak energy measurements.
  arXiv  Detail & Related papers  (2023-01-31T11:18:12Z)
• Powerful ordered collective heat engines [58.720142291102135]
  We introduce a class of engines in which the regime of units operating synchronously can boost the performance. We show that the interplay between Ising-like interactions and a collective ordered regime is crucial to operate as a heat engine.
  arXiv  Detail & Related papers  (2023-01-16T20:14:19Z)
• HEAT: Hardware-Efficient Automatic Tensor Decomposition for Transformer Compression [69.36555801766762]
  We propose a hardware-aware tensor decomposition framework, dubbed HEAT, that enables efficient exploration of the exponential space of possible decompositions. We experimentally show that our hardware-aware factorized BERT variants reduce the energy-delay product by 5.7x with less than 1.1% accuracy loss.
  arXiv  Detail & Related papers  (2022-11-30T05:31:45Z)
• PhAST: Physics-Aware, Scalable, and Task-specific GNNs for Accelerated Catalyst Design [102.9593507372373]
  Catalyst materials play a crucial role in the electrochemical reactions involved in industrial processes. Machine learning holds the potential to efficiently model materials properties from large amounts of data. We propose task-specific innovations applicable to most architectures, enhancing both computational efficiency and accuracy.
  arXiv  Detail & Related papers  (2022-11-22T05:24:30Z)
• Collective effects on the performance and stability of quantum heat engines [62.997667081978825]
  Recent predictions for quantum-mechanical enhancements in the operation of small heat engines have raised renewed interest. One essential question is whether collective effects may help to carry enhancements over larger scales. We study how power, efficiency and constancy scale with the number of spins composing the engine.
  arXiv  Detail & Related papers  (2021-06-25T18:00:07Z)
• Quantum Heat Engines with Carnot Efficiency at Maximum Power [0.0]
  We introduce quantum heat engines that deliver maximum power with Carnot efficiency in the one-shot finite-size regime. The engines operate in a one-step cycle by letting the working system simultaneously interact with hot and cold baths.
  arXiv  Detail & Related papers  (2021-06-02T14:34:38Z)
• Maximal power for heat engines: role of asymmetric interaction times [110.83289076967895]
  We introduce the idea of adjusting the interaction time asymmetry in order to optimize the engine performance. Distinct optimization protocols are analyzed in the framework of thermodynamics.
  arXiv  Detail & Related papers  (2020-12-16T22:26:14Z)
• A Feshbach engine in the Thomas-Fermi regime [2.39698636522191]
  A Bose-Einstein condensate can be used to produce work by tuning the strength of the interparticle interactions with the help of Feshbach resonances. These interaction ramps change the volume of the trapped gas allowing one to create a thermodynamic cycle known as the Feshbach engine. Here we investigate how such an engine can be run in the Thomas-Fermi regime and present a shortcut to adiabaticity that minimizes the irreversible work and allows for efficient engine operation.
  arXiv  Detail & Related papers  (2020-05-14T08:11:39Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.