Measurement-based quantum Otto engines with POVMs and non-adiabatic operation extract more net work than conventional or PVM-based engines in specific regimes, even after reset costs.
Uusn ¨akki, T
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abstract
Quantum heat engines require precise control over thermal reservoirs and the energies of the quantum working medium. Although superconducting circuits enable accurate engineering of controlled quantum systems, they have not yet been employed to experimentally realize a cyclic quantum heat engine. Here, we demonstrate a quantum heat engine with superconducting circuits, using a quantum-circuit refrigerator as a tunable heat reservoir and a flux-tunable transmon qubit as the working medium. Starting from a thermal state, we implement a few quantum Otto cycles with a tailored reservoir drive inducing sequential cooling and heating, interleaved with flux ramps controlling qubit frequency. Utilizing single-shot qubit readout, we monitor the qubit state evolution during the cycles and measure positive output powers and efficiencies, agreeing with corresponding simulations. Our results verify thermodynamic models of quantum heat engines, advance control of thermal environments, and open avenues for exploring possible quantum advantages.
verdicts
UNVERDICTED 4representative citing papers
A universal framework for strong-coupling quantum thermodynamics that defines an intrinsic Hamiltonian of mean force, preserves von Neumann entropy and standard gauge freedoms, and formulates first and second laws from microscopically accessible variables.
Numerical analysis of a two-qubit XYZ Heisenberg quantum Otto engine shows that reduced longitudinal coupling and optimized anisotropy improve net work and efficiency, with concurrence changes between isomagnetic strokes correlating to efficiency gains.
Classical thermodynamic uncertainty bounds on efficiency persist in quantum thermal machines with coherent transport, but cross-correlations optimize joint precision of currents near linear response.
citing papers explorer
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Optimal work extraction in measurement-based quantum Otto engines: Non-adiabaticity and generalized measurements can be beneficial
Measurement-based quantum Otto engines with POVMs and non-adiabatic operation extract more net work than conventional or PVM-based engines in specific regimes, even after reset costs.
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Intrinsic Hamiltonian of Mean Force and Strong-Coupling Quantum Thermodynamics
A universal framework for strong-coupling quantum thermodynamics that defines an intrinsic Hamiltonian of mean force, preserves von Neumann entropy and standard gauge freedoms, and formulates first and second laws from microscopically accessible variables.
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Quantum Otto engine powered by an anisotropic Heisenberg XYZ model under independent local magnetic fields
Numerical analysis of a two-qubit XYZ Heisenberg quantum Otto engine shows that reduced longitudinal coupling and optimized anisotropy improve net work and efficiency, with concurrence changes between isomagnetic strokes correlating to efficiency gains.
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Quantum Coherence Reshapes Thermodynamic Bounds for Thermal Machines
Classical thermodynamic uncertainty bounds on efficiency persist in quantum thermal machines with coherent transport, but cross-correlations optimize joint precision of currents near linear response.