Spatially dependent atom-photon entanglement

Abstract

The atom-photon entanglement using the Laguerre-Gaussian (LG) beams is studied in the closed-loop three-level V-type quantum systems. We consider two schemes with near-degenerate and non-degenerate upper levels: in the first, the effect of the quantum interference due to the spontaneous emission is taken into account and in the second, a microwave plane wave is applied to the upper levels transition. It is shown that the atom-photon entanglement in both schemes depends on the intensity profile as well as the orbital angular momentum (OAM) of the applied fields so that the various spatially dependent entanglement patterns can be generated by Laguerre-Gaussian beams with different OAMs. However, due to the zero intensity,no entanglement appears in the center of the optical vortex beams. As a result, the entanglement between dressed atom and its spontaneous emissions in different points of the atomic vapor cell can be controlled by the OAM of the applied fields. Moreover, our numerical results show that the number of the local maximum degree of entanglement (DEM) peaks depends on the OAM of the applied fields. The degrees of freedom for OAM play a crucial role in spatially dependent atom-photon entanglement in such a way that it may possess broad applications in high-dimensional quantum information processing and data storage.

Spatially structured optical effects via composite vortex light in a dielectric medium

“…These kinds of optical vortex beams have a characteristic phase factor and behave interestingly in atomic interactions [22][23][24][25][26]. Light-induced torque [27], atom vortex beams [28], OAM-based four-wave mixing [29], entanglement of OAM states in photon pairs [19], and spatially structured optical phenomena [30][31][32][33][34][35][36] are a few of the remarkable effects.…”

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].…”

Spatial dependent of the new generated light via Fano-interference in a quantum well nanostructure

“…We are aware that light beams have the potential to carry orbital angular momentum (OAM) [21][22][23]. In order to employ within quantum computation, quantum teleportation, and quantum information storage, we are able to provide additional options for the manipulation of light because it symbolizes any other degree of freedom [24][25][26][27]. The interaction of atoms with light-induced grating [28], atom vortex beams [29], atom-photon entanglement [30], OAM-based four-wave mixing (FWM) [31], spatially based optical transparency [25], and vortex slow light [21] are just a few of the fascinating results.…”