Continuous dynamical protection of two-qubit entanglement from uncorrelated dephasing, bit flipping, and dissipation
F. F. Fanchini, Reginaldo de Jesus Napolitano · Physical Review A · 2007
We show that a simple arrangement of external fields, consisting of a static component and an orthogonal rotating component, can continuously decouple a two-qubit entangled state from uncorrelated dephasing, bit flipping, and dissipation at finite temperature. We consider a situation where an entangled state shared between two noninteracting qubits is initially prepared and left to evolve under 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.