Photon condensation from thermal sources and the limits of heat engines
Luísa Toledo Tude, Emily Haughton, and Paul R. Eastham
Phys. Rev. A 113, L010201 (2026) - Published 2 January, 2026
The authors show how Bose-Einstein condensates of photons could be produced from incoherent thermal sources such as sunlight.
Theory-independent context incompatibility: Quantification and experimental demonstration
Mariana Storrer, Patrick Lima, Ana C. S. Costa, Sebastião Pádua, and Renato M. Angelo
Phys. Rev. A 113, L010202 (2026) - Published 7 January, 2026
The authors develop a framework for assessing compatibility in generic probabilistic contexts, extending beyond the constraints of standard quantum mechanics. Experiments with single photons show how quantum behavior contrasts with this broader criterion.
Emergence of distinct relaxation behavior and the quantum regression theorem in the ultrastrong-coupling limit
Sakil Khan and Bijay Kumar Agarwalla
Phys. Rev. A 113, L010203 (2026) - Published 26 January, 2026
For decades, the applicability of the quantum regression theorem (QRT) was believed to require weak coupling and Markovian dynamics. This work shows that the QRT remains valid beyond the weak-coupling limit and, in particular, in the ultrastrong-coupling regime.
























