Abstract
An open quantum bipartite system consisting of two independent two-level atoms interacting nonlinearly with a two-mode electromagnetic cavity field is investigated by proposing a suitable non-Hermitian generalization of the Hamiltonian. The mathematical procedure of obtaining the corresponding wave function of the system is clearly given. Pancharatnam phase is studied to give a precise information about the required initial system state, which is related to artificial phase jumps, to control the degree of entanglement (DEM) and get the highest concurrence. We discuss the effect of time-variation coupling, and dissipation of both atoms and cavity. The effect of the time-variation function appears as frequency modulation (FM) effect in the radio waves. Concurrence rapidly reaches the disentangled state (death of entanglement) by increasing the effect of field decay. On the contrary, the atomic decay has no effect.
Highlights
Stimulated Raman adiabatic passage (STIRAP) has been explained chemically and physically [37], and its protocols have been applied to various models to speed up adiabatic passage techniques and achieve fast and robust population control in two-level atomic systems [38,39], in a three-level system STIRAP [40,41,42] can be used to transfer population from the ground state |0i to the second excited state |2i without having excitations in state |1i during the process
To control the Degree of the Entanglement (DEM) of the system, we determine the initial latter phase by plotting the Pancharatnam phase for three different time points, and investigate the concurrence between the two atoms according to the best value of the latter phase
By increasing the effect of field decay parameter γ, the concurrence rapidly reaches to the disentangled state
Summary
Quantum systems promise enhanced capabilities in sensing, communications, and computing beyond what can be achieved with classical-based conventional technologies rather than quantum physics. To include the spatial shift of the two laser fields (a timing offset between the two fields affecting the molecules) confirmed that fully transfer efficiency should be achievable This prediction was experimentally demonstrated soon afterwards [36], where it was noted that the proposed and demonstrated technique does not require laser intensity modulation, laser frequency chirping, or level shifting. STIRAP has been explained chemically and physically [37], and its protocols have been applied to various models to speed up adiabatic passage techniques and achieve fast and robust population control in two-level atomic systems [38,39], in a three-level system STIRAP [40,41,42] can be used to transfer population from the ground state |0i to the second excited state |2i without having excitations in state |1i during the process.
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