Quantum coherence anvia additional qubits via additional qubits

In this paper, we investigate quantum coherence preservation of a single-qubit interacting with a zero temperature thermal reservoir through the addition of non-interacting qubits in the reservoir. Also, we extend this scheme to preserve quantum entanglement between two distant qubits, each of which interacts independently with separated reservoirs. It is observed that, as the number of additional qubits in each reservoir becomes large, the initial coherence and the entanglement are completely protected in both Markovian and non-Markovian regimes.