Investigating the Impact of Electromagnetic Fields on Local Quantum Fisher Information and Coherence in Graphene

Abstract This study explores the temporal evolution of local quantum Fisher information and coherence in a graphene monolayer subjected to a polarized electromagnetic field, revealing significant effects driven by system parameters. In the absence of the field, the analysis highlights the crucial role of the initial state's purity in the dynamics of both local quantum Fisher information and coherence, influencing their amplitude and decay over time. Introducing an electromagnetic field unveils a strong dependence of these quantities on the polarization and amplitude parameters. For linear polarization, local quantum Fisher information and coherence reach their maximum values at specific field phases, while for circular polarization, the system's response becomes more complex, exhibiting pronounced variations and a gradual decrease in coherence at higher field intensities. These findings emphasize the importance of controlling electromagnetic parameters to manipulate quantum information in graphene and open up new prospects for applications in quantum electronics and information processing.