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Irreversible quantum Carnot cycle and its comparison with quantum Otto cycle

Ferdi Altintas

Physics Letters AJan 6, 20253 citations

Irreversible Quantum Carnot Cycle and its Comparisonwith Quantum Otto Cycle for Non-Scalable Quantumsystems

Ferdi Altintas

Jan 1, 20240 citations

Dissipation and friction of a quantum spin system

Yang Wang, Yu Jia

The European Physical Journal BApr 1, 20222 citations

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

A Alecce, Fernando Galve, Nicola Lo Gullo +3 more

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 working substance consists of an ensemble of misaligned spins interacting with a magnetic field and performing the Otto cycle. The effect of this static disorder under a finite-time cycle gives a new perspective of the concept of inner friction under realistic settings. We investigate the efficiency and power of this engine and relate its performance to the amount of friction from misalignment and to the temperature difference between heat baths. Finally we propose an alternative experimental implementation of the cycle where the spin is encoded in the degree of polarization of photons.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 working substance consists of an ensemble of misaligned spins interacting with a magnetic field and performing the Otto cycle. The effect of this static disorder under a finite-time cycle gives a new perspective of the concept of inner friction under realistic settings. We investigate the efficiency and power of this engine and relate its performance to the amount of friction from misalignment and to the temperature difference between heat baths. Finally we propose an alternative experimental implementation of the cycle where the spin is encoded in the degree of polarization of photons.

arXiv:1507.03417New Journal of PhysicsJul 9, 201564 citations

More bang for your buck: Super-adiabatic quantum engines

Adolfo del Campo, John Goold, Mauro Paternostro

The practical untenability of the quasi-static assumption makes any realistic engine intrinsically irreversible and its operating time finite, thus implying friction effects at short cycle times. An important technological goal is thus the design of maximally efficient engines working at the maximum possible power. We show that, by utilising shortcuts to adiabaticity in a quantum engine cycle, one can engineer a thermodynamic cycle working at finite power and zero friction. Our findings are illustrated using a harmonic oscillator undergoing a quantum Otto cycle.The practical untenability of the quasi-static assumption makes any realistic engine intrinsically irreversible and its operating time finite, thus implying friction effects at short cycle times. An important technological goal is thus the design of maximally efficient engines working at the maximum possible power. We show that, by utilising shortcuts to adiabaticity in a quantum engine cycle, one can engineer a thermodynamic cycle working at finite power and zero friction. Our findings are illustrated using a harmonic oscillator undergoing a quantum Otto cycle.

arXiv:1305.3223Scientific ReportsAug 28, 2014306 citations

Performance of Quantum Otto Cycle via Schrödinger Equation in Deformed Formalism

Mohammad Damghani

Jan 1, 20250 citations

Irreversible work and internal friction in a quantum Otto cycle of a single arbitrary spin

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Irreversible work and internal friction in a quantum Otto cycle of a single arbitrary spin

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