Atom–photon entanglement beyond the multi-photon resonance condition

Abstract

The density matrix equations of motion in near-degenerate three-level V-type closedloop atomic system are calculated numerically in Floquet frame. The dynamical behavior of atom-photon entanglement between the dressed atom and its spontaneous emission is studied in semi classical approach beyond the two-photon resonance condition in such a system. The quantum entropy of these two subsystems is investigated by using the von Neumann entropy. It is shown that, the degree of entanglement measure (DEM) can be controlled via the intensity and the detuning of coupling optical field and quantum interference induced by spontaneous emission. Moreover in the absence of quantum interference the steady state behavior of DEM can be achieved even in beyond the two-photon resonance condition. Furthermore in the absence of quantum interference for special parameters of Rabi frequency and detuning of driving laser field disentanglement can be occurred. Also the electromagnetically induced transparency condition can be obtained when the system is disentangled.

The effect of classical driving field on the spectrum of a qubit and entanglement swapping inside dissipative cavities

“…In this section, we discuss how the classical driving field can affect dynamics evolution of entanglement between the qubit and its radiative decay. It is worth recalling that the effect of coupling field on the dynamics of atomphoton entanglement in multi-level systems is studied [63][64][65][66][67]. For the bipartite systems such as atom-field systems, one can employ the von Neumann entropy of reduced density matrixes as a tool to quantify the entanglement between the subsystems.…”

Entanglement control in a laser driven single layer graphene system

“…One of the more fascinating effects of atom-spontaneous interaction is atomic-photon entanglement [47][48][49][50][51][52][53]. Many quantum systems have looked at the different ways that atomphoton entanglement happens [51,[54][55][56][57][58][59][60][61]. Arzhang et al [62], for instance, looked at the tunneling effect's function in the time assessment of quantum entropy in connected quantum dots.…”

Controllable atom-photon entanglement via quantum interference near plasmonic nanostructure

“…Many proposals were presented to produce the entanglement between quantum systems and their spontaneous emission field. Some of these articles are including the generation of entanglement between the atom and its spontaneous emission field via quantum entropy under the EIT conditions [13][14][15] . Time dependent behavior of the atom-photon entanglement is discussed when a four-level atom is embedded near the band edge of a photonic crystal 16 .…”