Protection of entanglement from sudden death using continuous dynamical decoupling

TL;DR

This paper demonstrates that continuous dynamical decoupling can effectively prevent the sudden death of entanglement in two-qubit systems exposed to environmental noise at finite temperatures.

Contribution

It introduces a method to protect entanglement from sudden death using continuous dynamical decoupling under realistic thermal noise conditions.

Findings

Continuous dynamical decoupling delays entanglement sudden death.

Numerical solutions show effective entanglement preservation.

Protection works against dephasing, bit flipping, and dissipation.

Abstract

We show that continuous dynamical decoupling can protect a two-qubit entangled state from sudden death at finite temperature due to uncorrelated dephasing, bit flipping, and dissipation. We consider a situation where an entangled state shared between two non-interacting qubits is initially prepared and left evolve under the environmental perturbations and the protection of external fields. To illustrate the protection of the entanglement, we solve numerically a master equation in the Born approximation, considering independent boson fields at the same temperature coupled to the different error agents of each qubit.