Entropy and Variance Squeezing of a V‐Type Atom

ABSTRACT Motivated by the demand for ultra‐low‐noise atomic states in quantum physics, we investigate the squeezing effects of a V‐type atom in a dissipative cavity. We derive the analytical expressions for entropy and variance squeezing and explore their dynamic dependence on crucial physical parameters, including the atomic initial state, spontaneously generated interference (SGI), cavity–environment coupling, and atom–cavity detuning. The numerical results show that only the entropy squeezing can emerge and vanish in the course of time evolution, whereas no other form of atomic squeezing can be observed for real‐coefficient atomic initial states. Weak coupling can enhance the robustness of the entropy squeezing more effectively than strong coupling. SGI exerts a slight influence on the entropy squeezing. Detuning can effectively prolong the lifetime of the entropy squeezing. Entropy squeezing quantifies quantum fluctuations more precisely than variance squeezing. These findings are valuable for quantum information processing as an ultra‐low‐noise resource.