Related papers: Enhancing Quantum Otto Engine Performance in Generalized External Potential on Bose-Einstein Condensation Regime

Enhancing Quantum Otto Engine Performance in Generalized External Potential on Bose-Einstein Condensation Regime

URL: http://arxiv.org/abs/2307.01805v2
Date: Thu, 21 Mar 2024 19:21:57 GMT
Title: Enhancing Quantum Otto Engine Performance in Generalized External Potential on Bose-Einstein Condensation Regime
Authors: Zahara Zettira, Ade Fahriza, Zulfi Abdullah, Trengginas E P Sutantyo,
Abstract summary: We examine a quantum Otto engine using both Bose-Einstein Condensation (BEC) and normal Bose gas as working medium. We found that EMP is significantly higher when using BEC as a working medium, while EMP with normal Bose gas is just Curzon-Ahlborn efficiency.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: We examine a quantum Otto engine using both Bose-Einstein Condensation (BEC) and normal Bose gas as working medium trapped in generalized external potential. We treated the engine quasi-statically and endoreversibly. Since the expansion and compression in both quasi-static and endoreversible take place isentropic, the expression of efficiency is similar. However, the power output in the quasi-static cycle is zero due to infinite and long stroke time. In contrast, with an endoreversible cycle, thermalization with two reservoirs takes place at a finite time. We use Fourier's law in conduction to formulate the relation between temperature of medium and reservoir, making work depend on heating and cooling stroke time. Moreover, we maximized the power with respect to compression ratio $\kappa$ to obtain efficiency at maximum power (EMP). We found that EMP is significantly higher when using BEC as a working medium, meanwhile EMP with normal Bose gas is just Curzon-Ahlborn efficiency. We also investigate the effect of thermal contact time $\tau$ with hot $(\tau_{h})$ and cold $(\tau_{l})$ reservoir on EMP. We found that when complete thermalization, $\tau_{h}=\tau_{l}$, stroke time occurs, there are no significant differences. Nevertheless, while incomplete thermalization arise, by adjusting various cooling and heating stroke time, provides a significant result on EMP, which is much higher at $\tau_{h}<\tau_{l}$ stroke time whilst lower at $\tau_{h}>\tau_{l}$ stroke time. We conclude this incomplete thermalization leads to the condition where residual coherence emerges which enhances the EMP of the engine.

Related papers

Stochastic thermodynamics and the Ericsson nano engine -- Efficiency from equilibrium results [18.329732804539496]
We numerically compute the efficiency of the cycle in the quasi-static regime.<n>It is found that by increasing the system-bath coupling strength, the efficiency of the cycle can be tuned to a maximum.
arXiv Detail & Related papers (2024-11-05T18:12:23Z)
Prethermal Floquet time crystals in chiral multiferroic chains and applications as quantum sensors of AC fields [41.94295877935867]
We study the emergence of prethermal Floquet Time Crystal (pFTC) in disordered multiferroic chains. We derive the phase diagram of the model, characterizing the magnetization, entanglement, and coherence dynamics of the system. We also explore the application of the pFTC as quantum sensors of AC fields.
arXiv Detail & Related papers (2024-10-23T03:15:57Z)
Thermodynamic Roles of Quantum Environments: From Heat Baths to Work Reservoirs [49.1574468325115]
Environments in quantum thermodynamics usually take the role of heat baths. We show that within the same model, the environment can take three different thermodynamic roles. The exact role of the environment is determined by the strength and structure of the coupling.
arXiv Detail & Related papers (2024-08-01T15:39:06Z)
Energetics of the dissipative quantum oscillator [22.76327908349951]
We discuss some aspects of the energetics of a quantum Brownian particle placed in a harmonic trap. Based on the fluctuation-dissipation theorem, we analyze two distinct notions of thermally-averaged energy. We generalize our analysis to the case of the three-dimensional dissipative magneto-oscillator.
arXiv Detail & Related papers (2023-10-05T15:18:56Z)
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)
Fast Thermalization from the Eigenstate Thermalization Hypothesis [69.68937033275746]
Eigenstate Thermalization Hypothesis (ETH) has played a major role in understanding thermodynamic phenomena in closed quantum systems. This paper establishes a rigorous link between ETH and fast thermalization to the global Gibbs state. Our results explain finite-time thermalization in chaotic open quantum systems.
arXiv Detail & Related papers (2021-12-14T18:48:31Z)
Ultrafast dynamics of cold Fermi gas after a local quench [0.0]
We consider non-equilibrium dynamics of two initially independent reservoirs $A$ and $B$ filled with a cold Fermi gas coupled and decoupled by two quantum quenches following one another. We find that the von Neumann entropy production induced by the quench is faster than thermal transport between the reservoirs. We show that once $A$ and $B$ become coupled, their entropies grow (on a timescale of the Fermi time) faster than the heat flow within the system.
arXiv Detail & Related papers (2021-08-26T21:00:00Z)
Optimizing Thermodynamic Cycles with Two Finite-Sized Reservoirs [0.2134707644856286]
We study the non-equilibrium thermodynamics of a heat engine operating between two finite-sized reservoirs with well-defined temperatures. Our findings can be used to develop a general optimization scenario for thermodynamic cycles with finite-sized reservoirs in real-world circumstances.
arXiv Detail & Related papers (2021-07-23T16:40:42Z)
Geometric Heat Pump: Controlling Thermal Transport with Time-dependent Modulations [21.544545839943446]
We review the emergence and development of this so called geometric heat pump'' The generalization from the adiabatic to the non-adiabatic regime and the application of control theory are also discussed.
arXiv Detail & Related papers (2021-06-25T14:24:42Z)
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)
Finite-time quantum Stirling heat engine [0.0]
We study the thermodynamic performance of the finite-time non-regenerative Stirling cycle used as a quantum heat engine. We find that the finite-time dynamics and thermodynamics of the cycle depend non-trivially on the different time scales at play.
arXiv Detail & Related papers (2020-09-21T17:19:14Z)
Energy of a free Brownian particle coupled to thermal vacuum [0.0]
Experimentalists have come to temperatures very close to absolute zero at which physics that was once ordinary becomes extraordinary. We study the simplest open quantum system, namely, a free quantum Brownian particle coupled to thermal vacuum.
arXiv Detail & Related papers (2020-03-30T15:44:04Z)

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