Sustainable entangled state of two qubits with time-dependent dipole-dipole interaction under coherent electromagnetic field influence
Alexander Alexandrovich Biryukov, Марк Александрович Шлеенков · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2017
In this paper we study the quantum entanglement of two identical qubits which interact with electromagnetic field and each other by time-dependent dipole-dipole interaction. We develop original method in path integral approach for numerical calculation of density matrix and Peres-Horodecki parameter (the measure of qubits entanglement). By the use of obtained equations we investigate the dependence of quantum entanglement on dipole-dipole interaction amplitude and frequency as well as qubits phase difference. The results indicate on possibility of high-entanglement states exiting and long-time non-destructive control of them.