Cyclic quantum engines enhanced by strong bath coupling

Abstract

While strong system-bath coupling produces rich and interesting phenomena, applications to quantum thermal engines have been so far pointing mainly at detrimental effects. The delicate trade-off between efficiency loss due to strong coupling and power increase due to faster equilibration, while acknowledged, remained largely unexplored owing to the challenge of assessing precisely the equilibration time. Here, we overcome this obstacle by exploiting exact numerical simulations based on the hierarchical equations of motion (HEOM) formalism. We show that a quantum Otto cycle can perform better at strong (but not ultrastrong) coupling in that the product of the efficiency times the output power is maximized in this regime. In particular, we show that strong coupling allows one to obtain engines with larger efficiency than their weakly coupled counterparts, while sharing the same output power. Conversely, one can design strongly coupled engines with larger power than their weakly coupled counterparts, while sharing the same efficiency. Overall, our results provide situations where strong coupling can directly enhance the performance of thermodynamic operations, re-enforcing the importance of studying quantum thermal engines beyond standard configurations.

arXiv comment10 + 11 pages, 9 + 3 figures. Slight changes in the introduction. Accepted for publication in Phys. Rev. Applied

References in corpus (37)

• QuTiP 2: A Python framework for the dynamics of open quantum systems
• Quantum Thermodynamics
• Quantum Thermodynamic Cycles and quantum heat engines
• Quantum heat engines and refrigerators: Continuous devices
• Perspective: Numerically "exact" approach to open quantum dynamics: The hierarchical equations of motion (HEOM)
• Entropy production as correlation between system and reservoir
• Universal trade-off relation between power and efficiency for heat engines
• Environmental dynamics, correlations, and the emergence of noncanonical equilibrium states in open quantum systems
• Nonequilibrium thermodynamics in the strong coupling and non-Markovian regime based on a reaction coordinate mapping
• Quantum thermal absorption machines: refrigerators, engines and clocks
• Performance of a quantum heat engine at strong reservoir coupling
• Strong Coupling Thermodynamics of Open Quantum Systems
• Open quantum system dynamics and the mean force Gibbs state
• Strong coupling corrections in quantum thermodynamics
• Quantum Heat Current under Non-perturbative and Non-Markovian Conditions: Applications to Heat Machines
• Shortcut to Equilibration of an Open Quantum System
• Strongly coupled quantum heat machines
• Implications of non-Markovian dynamics for the Landauer bound
• QuTiP-BoFiN: A bosonic and fermionic numerical hierarchical-equations-of-motion library with applications in light-harvesting, quantum control, and single-molecule electronics
• Tunable phonon induced steady state coherence in a double quantum dot
• Weak and ultrastrong coupling limits of the quantum mean force Gibbs state
• Thermal machines beyond the weak coupling regime
• Out-of-equilibrium operation of a quantum heat engine: The cost of thermal coupling control
• Quantum thermodynamics in strong coupling: heat transport and refrigeration
• Quantum finite-time thermodynamics: insight from a single qubit engine
• Employing Non-Markovian effects to improve the performance of a quantum Otto refrigerator
• Qubit absorption refrigerator at strong coupling
• Roles of quantum coherences in thermal machines
• Quantum limit to nonequilibrium heat-engine performance imposed by strong system-reservoir coupling
• Non-Markovian thermal operations boosting the performance of quantum heat engines
• A quantum Otto engine with finite heat baths: energy, correlations, and degradation
• Non-Markovian effect on quantum Otto engine: -Role of system--reservoir interaction-
• Extending the laws of thermodynamics for arbitrary autonomous quantum systems
• Steady state in strong system-bath coupling: mean force Gibbs state versus reaction coordinate
• Steady state in ultrastrong coupling regime: perturbative expansion and first orders
• Energetic advantages of non-adiabatic drives combined with non-thermal quantum states
• Work fluctuations due to partial thermalizations in two-level systems

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• Dynamically Emergent Quantum Thermodynamics: Non-Markovian Otto Cycle
• Thermodynamic quantum Fokker-Planck equations and their application to thermostatic Stirling engine
• Dynamics of a strongly coupled quantum heat engine -- computing bath observables from the hierarchy of pure states
• Pseudomode treatment of strong-coupling quantum thermodynamics
• Classical and quantum thermodynamics in a non-equilibrium regime: Application to Stirling engine
• Quantum Carnot thermal machines re-examined: Definition of efficiency and the effects of strong coupling
• Classical and quantum thermodynamics described as a system-bath model: The dimensionless minimum work principle
• Nonequilibrium quantum heat transport between structured environments
• Input-Output Hierarchical Equations Of Motion
• Finite-time performance of a cyclic 2d quantum Ising heat engine
• Coupling-energy driven pumping through quantum dots: Role of coherences
• Entropy production versus memory effects in two-level open quantum systems
• Subtleties in the pseudomodes formalism