Quantum thermal machines and the emergence of different thermodynamic functioning regimes from finite coupling to a load
Gauthameshwar S., Noufal Jaseem, and Dario Poletti
Phys. Rev. A 112, L050201 (2025) - Published 6 November, 2025
The authors show that the functioning of a thermal machine is not only dependent on temperature differences, but is also critically affected by the magnitude of the coupling between the thermal machine and its load, and on the initial preparation of the load.
Incompatibility of deterministic underlying states with a counterfactual account of Lüders' rule
Alisson Tezzin, Bárbara Amaral, and Jonte R. Hance
Phys. Rev. A 112, L050202 (2025) - Published 10 November, 2025
The authors show that the quantum state update rule (Lüder’s Rule), when interpreted as the updated state telling us what future measurement results would be, stops the most common forms of the hidden-variable model of quantum mechanics (including ontological models) from modeling incompatible observables. Despite what is often claimed, this indicates that the inability of these models to reproduce quantum predictions for a given scenario may be telling us nothing more than “the scenario involves incompatible observables.”
Unveiling coherent dynamics in non-Markovian open quantum systems: Exact expression and recursive perturbation expansion
Alessandra Colla, Heinz-Peter Breuer, and Giulio Gasbarri
Phys. Rev. A 112, L050203 (2025) - Published 26 November, 2025
The authors identify the coherent contribution to non-Markovian open-system dynamics by deriving an explicit formula for the effective Hamiltonian and a recursive perturbation expansion. They demonstrate the approach on spin systems to reveal how environmental correlations affect energy levels.























