A quantum Otto-type heat engine with fixed frequency

Abstract

In this work, we analyze an Otto-type cycle operating with a working substance composed of a quantum harmonic oscillator (QHO). Unlike other studies in which the work extraction is done by varying the frequency of the QHO and letting it thermalize with a squeezed reservoir, here we submit the QHO to a parametric pumping controlled by the squeezing parameter and let it thermalize with a thermal reservoir. We then investigate the role of the squeezing parameter in our Otto-type engine powered by parametric pumping and show that it is possible to reach the Carnot limit by arbitrarily increasing the squeezing parameter. Notably, for certain squeezing parameters $r$, e.g. $r=0.4$, the quasi-static Otto limit can be reached even at non-zero power. We also investigated the role of entropy production in the efficiency behavior during the unitary strokes, showing that positive (negative) changes in entropy production correspond to increases (decreases) in engine efficiency, as expected. Furthermore, we show that under thermal reservoirs a work extraction process that is more efficient than the Carnot engine is impossible, regardless of the quantum resource introduced via the Hamiltonian of the system.

arXiv comment7 pages, 3 figures

References in corpus (27)

• QuTiP: An open-source Python framework for the dynamics of open quantum systems
• Circuit Quantum Electrodynamics
• A nano heat engine beyond the Carnot limit
• Single ion heat engine with maximum efficiency at maximum power
• Universality of efficiency at maximum power
• Generalized Clausius inequality for nonequilibrium quantum processes
• Squeezed thermal reservoirs as a resource for a nano-mechanical engine beyond the Carnot limit
• Coherence effects in the performance of the quantum Otto heat engine
• Irreversible work and inner friction in quantum thermodynamic processes
• Efficiency of a quantum Otto heat engine operating under a reservoir at effective negative temperatures
• Efficiency of harmonic quantum Otto engines at maximal power
• Demonstration of deterministic and high fidelity squeezing of quantum information
• Fluctuation Relation for Quantum Heat Engines and Refrigerators
• Exploring a new regime for processing optical qubits: squeezing and unsqueezing single photons
• Efficient simulation of open quantum systems coupled to a fermionic bath
• Experimental realization of a dynamic squeezing gate
• Squeezing arbitrary cavity-field states through their interaction with a single driven atom
• Finite-time quantum Otto engine: Surpassing the quasi-static efficiency due to friction
• Quantum heat engine operating between thermal and spin reservoirs
• Engineering squeezed states in high-Q cavities
• Two-level quantum Otto heat engine operating with unit efficiency far from the quasi-static regime under a squeezed reservoir
• Correlation-boosted quantum engine: A proof-of-principle demonstration
• Cooling with fermionic reservoir
• Carnot, Stirling, Ericsson stochastic heat engines: Efficiency at maximum power
• Enhanced Efficiency at Maximum Power in a Fock-Darwin Model Quantum Dot Engine
• Anharmonicity can enhance the performance of quantum refrigerators
• Power of a quasi-spin quantum Otto engine at negative effective temperature