Strong coupling in the entanglement dynamics of two qubits interacting with a graphene nanodisk

We investigate the entanglement dynamics of two qubits interacting with a graphene nanodisk using the macroscopic quantum electrodynamics method. By modifying the free-space decay rate of each qubit, we study the coupling strength between the nanoparticle and the qubits. We find that as the free-space decay rate increases, the decaying Rabi oscillations featured in the qubit population dynamics change to complex non-Markovian dynamical population evolution. This is also reflected on the concurrence, which at weak or moderate light-matter coupling conditions, attains values up to 0.5, while as the coupling conditions become stronger, larger values are also transiently observed. Our findings indicate that graphene nanostructures can provide a platform for the realization of high degree of entanglement in the strong coupling regime at the nanoscale, essential for quantum technology applications. Published under an exclusive license by AIP Publishing.

Automated summary

We investigate the entanglement dynamics between two qubits and a graphene nanodisk using the macroscopic quantum electrodynamics method. Our findings show that as the free-space decay rate increases, the decaying Rabi oscillations in the qubit population dynamics change to complex non-Markovian dynamical population evolution. This is also reflected in the concurrence, which can reach values up to 0.5 under weak or moderate light-matter coupling conditions and transiently higher values under stronger coupling conditions. These results demonstrate the potential of graphene nanostructures for realizing high degrees of entanglement at the nanoscale, which is crucial for quantum technology applications.