Teleporting the one-qubit state via two-level atoms with spontaneous emission

TL;DR

This paper investigates how spontaneous emission, collective damping, and dipole-dipole interactions affect the fidelity of quantum teleportation between two atoms, identifying conditions for nonclassical teleportation and the role of entanglement.

Contribution

It provides a detailed analysis of the impact of atomic interactions on teleportation fidelity and clarifies the role of entanglement beyond its presence in the channel state.

Findings

Identifies the spatial distance range for nonclassical teleportation.

Shows entanglement is necessary but not sufficient for high fidelity.

Analyzes the effects of spontaneous emission and dipole interactions on fidelity.

Abstract

We study quantum teleportation via two two-level atoms coupled collectively to a multimode vacuum field and prepared initially in different atomic states. We concentrated on influence of the spontaneous emission, collective damping and dipole-dipole interaction of the atoms on fidelity dynamics of quantum teleportation and obtained the region of spatial distance between the two atoms over which the state can be teleported nonclassically. Moreover, we showed through concrete examples that entanglement of the channel state is the prerequisite but not the only essential quantity for predicting the teleportation fidelity.