Atom–Atom Entanglement in a Nonresonant Two-Photon Tavis–Cummings Model
Maria O. Guslyannikova, Eugene K. Bashkirov · Bulletin of the Russian Academy of Sciences Physics · 2020
Abstract Entanglement between two identical two-level atoms (qubits) that interact nonresonantly with the thermal field of a single-mode ideal resonator via effective degenerate two-photon transitions is studied. Based on an exact solution for the time-dependent density matrix, negativity is calculated as a measure of atom entanglement. The effect detuning between the atomic frequencies and the doubled frequency of the resonator field has on the dynamics of qubit entanglement in cases of separable and entangled initial atomic states is investigated.