Related papers: Operational modes of a Raman-coupled two-qubit quantum thermal machine

Operational modes of a Raman-coupled two-qubit quantum thermal machine

URL: http://arxiv.org/abs/2601.03139v1
Date: Tue, 06 Jan 2026 16:09:41 GMT
Title: Operational modes of a Raman-coupled two-qubit quantum thermal machine
Authors: Alonso Alcalá, Charlie Oncebay, Onofre Rojas, Moises Rojas,
Abstract summary: We investigate a quantum thermal machine composed of two qubits coupled through a Raman-induced exchange interaction.<n>The system is analyzed within Carnot, Otto, and Stirling thermodynamic cycles, including the Stirling cycle with and without regeneration.
Score: 0.0
License: http://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract: We investigate a quantum thermal machine composed of two qubits coupled through a Raman-induced exchange interaction and driven by inhomogeneous transition frequencies. The system is analyzed within Carnot, Otto, and Stirling thermodynamic cycles, including the Stirling cycle with and without regeneration. We identify the conditions under which the device operates as a heat engine, refrigerator, thermal accelerator, or heater. Efficiency maps and operational-mode diagrams reveal well-defined boundaries in parameter space, governed by the frequency ratio $r=\barω/ω$, the coupling strength $g$, and the thermal gradient between reservoirs. The Carnot cycle exhibits sharp transitions between engine and refrigerator regimes, while the Otto cycle displays a richer structure with the coexistence of all operational modes. The Stirling cycle shows enhanced versatility and performance, particularly when assisted by a regenerator, where near-ideal efficiencies are achieved. Overall, the Raman-type interaction introduces a controllable left-right asymmetry that enables nontrivial manipulation of thermodynamic behavior through frequency tuning.

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