Two-level masers as heat-to-work converters

Authors: Arnab Ghosh, David Gelbwaser-Klimovsky, Wolfgang Niedenzub, Alexander I. Lvovskye, Igor Mazets, Marlan O. Scullyk and Gershon Kurizki
Published on: PNAS 115, 9941 (2018).
Key Question:How to build a quantum heat engine with a maser?