A finite-time quantum Otto engine with tunnel coupled one-dimensional Bose gases

• URL: http://arxiv.org/abs/2404.16470v1
• Date: Thu, 25 Apr 2024 09:54:21 GMT
• Title: A finite-time quantum Otto engine with tunnel coupled one-dimensional Bose gases
• Authors: V. V. Nautiyal, R. S. Watson, K. V. Kheruntsyan,
• Abstract summary: 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.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We undertake a theoretical study of a finite-time quantum Otto engine cycle driven by inter-particle interactions in a weakly interacting one-dimensional Bose gas in the quasicondensate regime. Utilizing a $c$-field approach, we simulate the entire Otto cycle, i.e. the two work strokes and the two equilibration strokes. More specifically, the interaction-induced work strokes are modelled by treating the working fluid as an isolated quantum many-body system undergoing unitary evolution. The equilibration strokes, on the other hand, are modelled by treating the working fluid as an open quantum system tunnel-coupled to another quasicondensate which acts as either the hot or cold reservoir, albeit of finite size. We find that, unlike a uniform 1D Bose gas, a harmonically trapped quasicondensate cannot operate purely as a \emph{heat} engine; instead, the engine operation is enabled by additional \emph{chemical} work performed on the working fluid, facilitated by the inflow of particles from the hot reservoir. The microscopic treatment of dynamics during equilibration strokes enables us to evaluate the characteristic operational time scales of this Otto chemical engine, crucial for characterizing its power output, without any \emph{ad hoc} assumptions about typical thermalization timescales. We analyse the performance and quantify the figures of merit of the proposed Otto chemical engine, finding that it offers a favourable trade-off between efficiency and power output, particularly when the interaction-induced work strokes are implemented via a sudden quench. We further demonstrate that in the sudden quench regime, the engine operates with an efficiency close to the near-adiabatic (near maximum efficiency) limit, while concurrently achieving maximum power output.

Related papers

• Three-dimensional harmonic oscillator as a quantum Otto engine [65.268245109828]
  The coupling between the working fluid and the baths is controlled using an external central potential. The efficiency and power of several realizations of the proposed engine are computed.
  arXiv  Detail & Related papers  (2023-12-06T09:52:53Z)
• Temperature- and interaction-tweaked efficiency boost of finite-time robust quantum Otto engines [0.0]
  A finite-time quantum Otto engine, employing a spin-1/2 particle as the working substance, can achieve higher efficiency than an ideal quantum Otto engine. Glassy disorder within the system-bath coupling during the two isochoric strokes on the efficiency of a finite-time quantum Otto engine is studied.
  arXiv  Detail & Related papers  (2023-09-20T17:28:14Z)
• Quantum field heat engine powered by phonon-photon interactions [58.720142291102135]
  We present a quantum heat engine based on a cavity with two oscillating mirrors. The engine performs an Otto cycle during which the walls and a field mode interact via a nonlinear Hamiltonian.
  arXiv  Detail & Related papers  (2023-05-10T20:27:15Z)
• Measurement-based quantum Otto engine with a two-spin system coupled by anisotropic interaction: enhanced efficiency at finite times [0.0]
  We have studied the performance of a measurement-based quantum Otto engine (QOE) in a working system of two spins coupled by Heisenberg anisotropic interaction.
  arXiv  Detail & Related papers  (2023-04-12T14:18:40Z)
• The quantum Otto cycle in a superconducting cavity in the non-adiabatic regime [62.997667081978825]
  We analyze the efficiency of the quantum Otto cycle applied to a superconducting cavity. It is shown that, in a non-adiabatic regime, the efficiency of the quantum cycle is affected by the dynamical Casimir effect.
  arXiv  Detail & Related papers  (2021-11-30T11:47:33Z)
• Pulsed multireservoir engineering for a trapped ion with applications to state synthesis and quantum Otto cycles [68.8204255655161]
  Reservoir engineering is a remarkable task that takes dissipation and decoherence as tools rather than impediments. We develop a collisional model to implement reservoir engineering for the one-dimensional harmonic motion of a trapped ion. Having multiple internal levels, we show that multiple reservoirs can be engineered, allowing for more efficient synthesis of well-known non-classical states of motion.
  arXiv  Detail & Related papers  (2021-11-26T08:32:39Z)
• Quantum heat engines with complex working media, complete Otto cycles and heuristics [0.0]
  We examine the performance of a quasi-static quantum Otto engine based on two spins of arbitrary magnitudes. The study of complete Otto cycles inherent in the average cycle also yields interesting insights into the average performance.
  arXiv  Detail & Related papers  (2021-07-26T16:18:50Z)
• 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)
• Light-matter quantum Otto engine in finite time [0.0]
  We study a quantum Otto engine at finite time, where the working substance is composed of a two-level system interacting with a harmonic oscillator. We relate the total work extracted and the efficiency at maximum power with the quantum correlations embedded in the working substance. We find that the engine can overcome the Curzon-Ahlborn efficiency when the working substance is in the ultrastrong coupling regime.
  arXiv  Detail & Related papers  (2021-02-21T08:40:12Z)
• 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)
• Non-Markovian effect on quantum Otto engine: -Role of system--reservoir interaction- [0.0]
  We study a limit cycle of a quantum Otto engine whose each cycle consists of two finite-time quantum isochoric processes. We investigate the non-Markovian effect (short-time behavior of the reduced dynamics in the quantum isochoric processes) on work extraction after infinite repetition of the cycles.
  arXiv  Detail & Related papers  (2020-06-24T10:01:24Z)

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.