Optimal measurement-based quantum thermal machines in a finite-size system

• URL: http://arxiv.org/abs/2603.25128v1
• Date: Thu, 26 Mar 2026 07:51:16 GMT
• Title: Optimal measurement-based quantum thermal machines in a finite-size system
• Abstract summary: We present a measurement-based quantum thermal machine that extracts work from generalized quantum measurements.<n>We derive universal optimization criteria for a three-stroke measurement-based engine cycle with coupled two-level system of Ising-like interaction as a working medium.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a measurement-based quantum thermal machine that extracts work from the back-action of generalized quantum measurements whose working medium is a coupled two-level quantum system. Specifically, we derive universal optimization criteria for a three-stroke measurement-based engine cycle with coupled two-level system of Ising-like interaction as a working medium. Furthermore, we present two numerical algorithms to optimize the engine work extraction and enhance its performance. Our numerical results demonstrate: (i) efficiency peaks in the projective-measurement limit; (ii) symmetry breaking (detuning or weak coupling) enlarges the exploitable energy gap; and (iii) performance remains robust ($>50\%$ of optimum) under $\sim\!10^\circ$ feedback-pulse errors. The framework is platform-agnostic and directly implementable with current superconducting, trapped-ion, or NMR technologies, providing a concrete route to scalable, measurement-powered quantum thermal machines.

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