# Finite-time quantum Otto engine: Surpassing the quasistatic efficiency due to friction.

@article{Lee2020FinitetimeQO, title={Finite-time quantum Otto engine: Surpassing the quasistatic efficiency due to friction.}, author={Sangyun Lee and Meesoon Ha and Jong-Min Park and Hawoong Jeong}, journal={Physical review. E}, year={2020}, volume={101 2-1}, pages={ 022127 } }

In finite-time quantum heat engines, some work is consumed to drive a working fluid accompanying coherence, which is called "friction." To understand the role of friction in quantum thermodynamics, we present a couple of finite-time quantum Otto cycles with two different baths: Agarwal versus Lindbladian. We solve them exactly and compare the performance of the Agarwal engine with that of the Lindbladian engine. In particular, we find remarkable and counterintuitive results that the performance…

## 10 Citations

### Quantum Heat Engines with Complex Working Media, Complete Otto Cycles and Heuristics

- PhysicsEntropy
- 2021

This paper examines the performance of a quasi-static quantum Otto engine based on two spins of arbitrary magnitudes subject to an external magnetic field and coupled via an isotropic Heisenberg exchange interaction and formulates heuristics to infer the necessary conditions for an engine with uncoupled as well as coupled spin model.

### Numerically "exact" simulations of a quantum Carnot cycle: Analysis using thermodynamic work diagrams.

- PhysicsThe Journal of chemical physics
- 2022

We investigate the efficiency of a quantum Carnot engine based on open quantum dynamics theory. The model includes time-dependent external fields for the subsystems controlling the isothermal and…

### Quantum Otto refrigerators in finite-time cycle period

- Physics
- 2021

Finite-time cycle period for a quantum Otto machine implies that either an adiabatic stroke or an isochoric process proceeds in finite time duration. The quantum Otto refrigerators under…

### The invariant-based shortcut to adiabaticity for qubit heat engine operates under quantum Otto cycle

- PhysicsThe European Physical Journal Plus
- 2022

In this paper, we study the role and relevance of the cost for an invariant-based shortcut to adiabaticity enabled qubit heat engine operates in a quantum Otto cycle. We consider a qubit heat engine…

### Thermodynamics of Statistical Anyons

- Physics
- 2021

In low-dimensional systems, indistinguishable particles can display statistics that interpolate between bosons and fermions. Signatures of these “anyons” have been detected in two-dimensional…

### Thermodynamics of the Coarse-Graining Master Equation

- MathematicsEntropy
- 2020

It is shown that the coarse-graining approach to derive a generator for the evolution of an open quantum system over a finite time interval generally leads to a Lindblad–Gorini–Kossakowski–Sudarshan generator.

### The efficiency of Quantum Mechanical Carnot Engine using the Woods Saxon model

- Physics
- 2022

E. O. Oladimeji; T. T. Ibrahim; A. N. Ikot; J. D. Koffa; H. O. Edogbanya; E. C. Umeh; J. O. Audu. 1. Theoretical Physics Group, Department of Physics, Federal University Lokoja, Lokoja, Nigeria. 2.…

### The laws of thermodynamics for quantum dissipative systems: A quasi-equilibrium Helmholtz energy approach.

- PhysicsThe Journal of chemical physics
- 2022

By using the quasi-equilibrium Helmholtz energy, which is defined as the thermodynamic work in a quasi-static process, we investigate the thermal properties of both an isothermal process and a…

### Optimal Control of Hydrogen Atom-Like Systems as Thermodynamic Engines in Finite Time

- PhysicsEntropy
- 2020

The minimal thermodynamic length criterion of optimality for finite-time processes also applies to these cycles for general statistical mechanical systems that can be controlled by a parameter κ, and an appropriate metric in probability distribution space is derived.

### Universal two-level quantum Otto machine under a squeezed reservoir.

- PhysicsPhysical review. E
- 2020

This model studies an Otto heat machine whose working substance is a single two-level system interacting with a cold thermal reservoir and with a squeezed hot thermal reservoir to show that this system can function as a universal heat machine.

## References

SHOWING 1-10 OF 72 REFERENCES

### Quantum Otto cycle with inner friction: finite-time and disorder effects

- Physics
- 2015

The concept of inner friction, by which a quantum heat engine is unable to follow adiabatically its strokes and thus dissipates useful energy, is illustrated in an exact physical model where the…

### Boosting the performance of quantum Otto heat engines.

- PhysicsPhysical review. E
- 2019

The finite-time quantum Otto engine is built, and it is found that the oscillating extra work leads to a jagged edge in the constraint relation between the output power and the efficiency.

### Irreversible performance of a quantum harmonic heat engine

- Physics
- 2006

The unavoidable irreversible loss of power in a heat engine is found to be of quantum origin. Following thermodynamic tradition, a model quantum heat engine operating in an Otto cycle is analysed,…

### Coherence effects in the performance of the quantum Otto heat engine

- PhysicsPhysical Review A
- 2019

The working substance fueling a quantum heat engine may contain coherence in its energy basis, depending on the dynamics of the engine cycle. In some models of quantum Otto heat engines, energy…

### Thermodynamical analysis of a quantum heat engine based on harmonic oscillators.

- PhysicsPhysical review. E
- 2016

An analytical method to find the limit cycle and give conditions for a stable limit cycle to exist is described and the global optimum is found and interestingly comes with a particular value of the cycle time.

### Quantum dynamical framework for Brownian heat engines.

- PhysicsPhysical review. E, Statistical, nonlinear, and soft matter physics
- 2013

We present a self-contained formalism modeled after the Brownian motion of a quantum harmonic oscillator for describing the performance of microscopic Brownian heat engines such as Carnot, Stirling,…

### Collective performance of a finite-time quantum Otto cycle.

- PhysicsPhysical review. E
- 2019

It is demonstrated that the quantum phase transitions for the ground and excited states may have a strong negative effect on the performance of the machine and by analyzing the work output, one can distinguish between the operational regimes with and without a phase transition.

### Quantum mechanical bound for efficiency of quantum Otto heat engine.

- PhysicsPhysical review. E
- 2019

This work demonstrates that quantum nature could suppress the performance of heat engines in terms of efficiency bound, work, and power output.

### The Quantum Harmonic Otto Cycle

- PhysicsEntropy
- 2017

The quantum Otto cycle serves as a bridge between the macroscopic world of heat engines and the quantum regime of thermal devices composed from a single element, and the dynamical model enables the study of finite time cycles limiting time on the adiabatic and the thermalization times.

### Shortcut-to-adiabaticity Otto engine: A twist to finite-time thermodynamics.

- PhysicsPhysical review. E
- 2019

A finite-time Otto engine operating on a quantum harmonic oscillator and driven by shortcut-to-adiabaticity (STA) techniques to speed up its cycle is considered, showing that time-averaged efficiency and power are useful cost functions for the characterization of the performance of the engine.