Impurity reveals distinct operational phases in quantum thermodynamic
cycles
- URL: http://arxiv.org/abs/2207.02638v2
- Date: Mon, 10 Oct 2022 13:50:27 GMT
- Title: Impurity reveals distinct operational phases in quantum thermodynamic
cycles
- Authors: Aditya Prakash, Abhishek Kumar, Colin Benjamin
- Abstract summary: impurity unlocks new operational phases in the system, such as a quantum heat engine, quantum refrigerator, and quantum cold pump.
The cooling power and coefficient of performance of the quantum refrigerator and quantum cold pump are non-trivially affected by the impurity.
- Score: 23.09629129922603
- License: http://creativecommons.org/licenses/by-nc-nd/4.0/
- Abstract: We analyze the effect of impurity on the work output and efficiency of
quantum Otto and quantum Carnot heat cycles, modeled as a single quantum
particle in an infinite square well (ISW) potential, which is the working
substance. We solve this quantum mechanical system perturbatively up to first
and second order in strength of the impurity for strong and weak coupling
regimes, respectively. We derive the analytical expressions of work and
efficiency for the strong coupling regime to the first order in the strength
parameter. The threshold value of the strength parameter in weak coupling is
obtained up to which the numerical result agrees with the perturbative result
for a repulsive and attractive impurity. To our surprise, an embedded impurity
unlocks new operational phases in the system, such as a quantum heat engine,
quantum refrigerator, and quantum cold pump. In addition, the efficiency of the
quantum Otto heat engine is seen to reach Carnot efficiency for some parameter
regimes. The cooling power and coefficient of performance of the quantum
refrigerator and quantum cold pump are non-trivially affected by the impurity.
Related papers
- Amplification of quantum transfer and quantum ratchet [56.47577824219207]
We study a model of amplification of quantum transfer and making it directed which we call the quantum ratchet model.
The ratchet effect is achieved in the quantum control model with dissipation and sink, where the Hamiltonian depends on vibrations in the energy difference synchronized with transitions between energy levels.
Amplitude and frequency of the oscillating vibron together with the dephasing rate are the parameters of the quantum ratchet which determine its efficiency.
arXiv Detail & Related papers (2023-12-31T14:04:43Z) - Thermodynamics of adiabatic quantum pumping in quantum dots [50.24983453990065]
We consider adiabatic quantum pumping through a resonant level model, a single-level quantum dot connected to two fermionic leads.
We develop a self-contained thermodynamic description of this model accounting for the variation of the energy level of the dot and the tunnelling rates with the thermal baths.
arXiv Detail & Related papers (2023-06-14T16:29:18Z) - Universality of critical dynamics with finite entanglement [68.8204255655161]
We study how low-energy dynamics of quantum systems near criticality are modified by finite entanglement.
Our result establishes the precise role played by entanglement in time-dependent critical phenomena.
arXiv Detail & Related papers (2023-01-23T19:23:54Z) - Quantum Otto engine with quantum correlations [3.740507726022551]
We investigate a photo-Otto engine that is working with a single-mode radiation field inside an optical cavity and driven by a hot and a cold reservoir.
We show that quantum discord boosts the performance and efficiency of the quantum engine, and even may change the operation mode.
arXiv Detail & Related papers (2022-11-23T02:56:10Z) - Effective Hamiltonian theory of open quantum systems at strong coupling [0.0]
We present the reaction-coordinate polaron-transform (RCPT) framework for generating effective Hamiltonian models.
Examples in this work include canonical models for quantum thermalization, charge and energy transport at the nanoscale, performance bounds of quantum thermodynamical machines.
arXiv Detail & Related papers (2022-11-10T17:10:33Z) - Thermodynamics and Fluctuations in Quantum Heat Engines under Reservoir
Squeezing [7.109424824240926]
We show that reservoir squeezing significantly enhances the performance by increasing the thermodynamic efficiency and the power.
An experimental scheme for realizing this quantum heat engine is proposed using a single-electron spin pertaining to a trapped 40Ca$+$ ion.
arXiv Detail & Related papers (2022-09-13T11:15:31Z) - Demonstrating Quantum Microscopic Reversibility Using Coherent States of
Light [58.8645797643406]
We propose and experimentally test a quantum generalization of the microscopic reversibility when a quantum system interacts with a heat bath.
We verify that the quantum modification for the principle of microscopic reversibility is critical in the low-temperature limit.
arXiv Detail & Related papers (2022-05-26T00:25:29Z) - 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) - 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)
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.