Optimal asymptotic pure-state conversion under thermal operations

arXiv:2611.08974v1 Announce Type: new Abstract: Quantum thermodynamics seeks to characterize possible state transformations under thermodynamic constraints in microscopic quantum systems. In the fully quantum regime, however, quantum coherence imposes various restrictions on state conversions, and a complete characterization of state convertibility has remained open. Here we resolve this problem for asymptotic conversions between pure states. Specifically, we show that asymptotic convertibility is fully determined by the free-energy and energy-variance ratios. Our result reveals how genuinely quantum effects quantitatively constrain state conversions in quantum thermodynamics.