Protecting entanglement by adjusting the velocities of moving qubits inside non-Markovian environments

Abstract

Efficient entanglement preservation in open quantum systems is a crucial\nscope towards a reliable exploitation of quantum resources. We address this\nissue by studying how two-qubit entanglement dynamically behaves when two atom\nqubits move inside two separated identical cavities. The moving qubits\nindependently interact with their respective cavity. As a main general result,\nwe find that under resonant qubit-cavity interaction the initial entanglement\nbetween two moving qubits remains closer to its initial value as time passes\ncompared to the case of stationary qubits. In particular, we show that the\ninitial entanglement can be strongly protected from decay by suitably adjusting\nthe velocities of the qubits according to the non-Markovian features of the\ncavities. Our results supply a further way of preserving quantum correlations\nagainst noise with a natural implementation in cavity-QED scenarios and are\nstraightforwardly extendable to many qubits for scalability.\n