Role of Stark shift effect in preserving quantum correlations

In this talk, I will present an analysis of the dynamics of quantum correlations in a system of two two-level atoms undergoing two-photon transitions via an intermediate virtual state. Each atom is coupled to a dissipative reservoir at zero temperature, with the presence of the Stark shift effect playing a crucial role. We explore the exact expressions for Bures distance entanglement, trace distance discord, and local quantum uncertainty under two different environmental initial conditions: the ground state and the first excited state. Notably, the first excited state reveals the influence of both Stark shift parameters, whereas the ground state only highlights one. Our findings indicate that quantum correlations can be maintained for extended periods due to the Stark shift effect, with a more pronounced impact observed in non-Markovian reservoirs, even at minimal Stark shift values. Additionally, we identify a sudden change phenomenon in local quantum uncertainty, marked by an abrupt shift in the decay rate. These results are crucial for understanding how to preserve quantum correlations, which are essential for optimizing performance in quantum information processing.
Reference:
(1) Chandra, Nitish Kumar, Rajiuddin Sk, and Prasanta K. Panigrahi. "Preservation and enhancement of quantum correlations under Stark effect." Journal of Modern Optics 70.4 (2023): 232-242.
(2) Bashkirov, E. K., and M. S. Rusakova. "Entanglement for two-atom Tavis–Cummings model with degenerate two-photon transitions in the presence of the Stark shift." Optik 123.19 (2012): 1694-1699.