Work-minimizing protocols in driven-dissipative quantum systems: An impulse-ansatz approach

Abstract:The second law of thermodynamics sets a lower bound on the work required to drive a system between thermal equilibrium states, with equality attained in the quasistatic limit. For finite-time processes, work in excess of this bound is inevitably dissipated, motivating the search for driving protocols that minimize this excess work. While classical stochastic systems have been extensively explored, quantum analyses remain limited and often rely on Markovian master equations valid only in the weak-coupling regime. Here, we study minimal work protocols for representative two-level systems coupled to a harmonic-oscillator bath using a numerically exact method. Inspired by known optimal solutions for Brownian oscillators, we introduce an impulse ansatz that incorporates possible boundary impulses and test it across a wide range of bath parameters. We find that impulse-like features remain nearly optimal in the quantum, non-Markovian regime at short times. We also identify cases in which the widely used Markovian master equation fails even at weak coupling, highlighting the necessity of going beyond standard approximations in the quantum regime for finite-time thermodynamic optimization.

8+8 pages, 5+2 figures. Major updates include replacing the Nelder-Mead optimizer with L-BFGS-B for the parameter optimization with a smaller convergence tolerance

arXiv:2511.15084 [quant-ph]

(or arXiv:2511.15084v2 [quant-ph] for this version)