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Fecha
2026-02-03
Derechos de acceso
info:eu-repo/semantics/openAccess
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Editorial
Springer
Citas
Resumen
Real refrigerators operate in finite time, deviating from classical thermodynamics, which predicts zero cooling power at Carnot efficiency. Finite-time thermodynamics (FTT) addresses this by incorporating realistic constraints, but quantum extensions often rely on the weak-coupling approximation. This approximation fails in systems—such as superconducting circuits or nanomechanical resonators—where qubit-bath interactions are strong. To overcome this, we study a one-qubit refrigerator using the non-perturbative reaction-coordinate polaron transform (RCPT), which systematically captures strong-coupling effects through an exact mapping and dressing of a collective bath mode. We derive the renormalized qubit energy and effective dissipation rates, leading to a closed expression for the steady-state cooling power QRCPT c (λ). Numerical optimization reveals a critical coupling strength λc ≈ 0.71 beyond which cooling performance deteriorates sharply. We analyze the impact of coupling strength on the maximum cooling power, the trade-off function , and a family of figures of merit εI Qc. Our results establish the validity bounds of the weak-coupling approximation and demonstrate that excessive coupling suppresses energy extraction, providing essential guidelines for designing robust quantum thermal devices in the strong-coupling regime.
Descripción
The registered version of this article, first published in “European Physical Journal Plus 141 (2026), 107", is available online at the publisher's website: Springer, https://doi.org/10.1140/epjp/s13360-026-07341-0
La versión registrada de este artículo, publicado por primera vez en “European Physical Journal Plus 141 (2026), 107", está disponible en línea en el sitio web del editor: Springer, https://doi.org/10.1140/epjp/s13360-026-07341-0
La versión registrada de este artículo, publicado por primera vez en “European Physical Journal Plus 141 (2026), 107", está disponible en línea en el sitio web del editor: Springer, https://doi.org/10.1140/epjp/s13360-026-07341-0
Categorías UNESCO
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Citación
Fernández, J.J., (2026). Optimizing one-qubit refrigerators in the strong-coupling regime. European Physical Journal Plus 141, 107. https://doi.org/10.1140/epjp/s13360-026-07341-0
Centro
Facultad de Ciencias
Departamento
Física Fundamental