biostudies-literatureUnknown9(1)Ghasemi FQuantum Zeno and anti-Zeno behaviors of a two-level macroscopic quantum system in interaction with a harmonic environment are studied using the perturbation theory. The system-environment interactions are applied in a successive and step-by-step way. A new expression for the probability of surviving the macrosystem in its initial state, after the Nth interaction step, is derived through a different method of calculation. It is shown that multiple transitions between Zeno and anti-Zeno behaviors can be found in our approach. We have shown that in addition to the environmental parameters like the Ohmicity, the macroscopic trait of the system also has a notable effect on the decay rate Γ(τ). Moreover, we have investigated how the decay rate Γ(τ) varies as the parameter of the macroscopicity oScientific reports15265https://www.ebi.ac.uk/biostudies/studies/S-EPMC6813307biostudies-literatureA new approach to study the Zeno effect for a macroscopic quantum system under frequent interactions with a harmonic environment.PMC6813307Ghasemi FShafiee AfalseA new approach to study the Zeno effect for a macroscopic quantum system under frequent interactions with a harmonic environment.Quantum Zeno and anti-Zeno behaviors of a two-level macroscopic quantum system in interaction with a harmonic environment are studied using the perturbation theory. The system-environment interactions are applied in a successive and step-by-step way. A new expression for the probability of surviving the macrosystem in its initial state, after the Nth interaction step, is derived through a different method of calculation. It is shown that multiple transitions between Zeno and anti-Zeno behaviors can be found in our approach. We have shown that in addition to the environmental parameters like the Ohmicity, the macroscopic trait of the system also has a notable effect on the decay rate Γ(τ). Moreover, we have investigated how the decay rate Γ(τ) varies as the parameter of the macroscopicity o2019-01-01T00:00:00Z2019 Oct2025-04-18T17:15:38.535Z2019-11-07T08:07:00ZS-EPMC68133073164929110.1038/s41598-019-51729-1