Bright and Dark periods in the Entanglement Dynamics of Interacting Qubits in Contact with the Environment

TL;DR

This paper investigates how interactions between two qubits influence their entanglement dynamics in the presence of environmental noise, revealing the emergence of bright and dark periods as precursors to entanglement sudden death.

Contribution

It demonstrates that inter-qubit interactions induce bright and dark periods in entanglement dynamics, a phenomenon that occurs across various environmental models, extending understanding of entanglement decay.

Findings

Bright and dark periods are observed in entanglement dynamics due to qubit interactions.

These features serve as precursors to entanglement sudden death.

The phenomena are generic across different environmental models.

Abstract

Interaction among the qubits are basis to many quantum logic operations. We report how such inter-qubit interactions can lead to new features, in the form of bright and dark periods in the entanglement dynamics of two qubits subject to environmental perturbations. These features are seen to be precursors to the well known phenomenon of sudden death of entanglement [Yu $&$ Eberly, Phys. Rev. Lett. {\bf 93}, 140404 (2004)] for noninteracting qubits. Further we find that the generation of bright and dark periods are generic and occur for wide varieties of the models of environment. We present explicit results for two popular models.