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

TL;DR

This paper demonstrates that adjusting the velocities of moving qubits inside non-Markovian cavities can significantly protect their entanglement from decay, offering a practical method for quantum resource preservation.

Contribution

It introduces a novel approach of velocity adjustment to preserve entanglement in non-Markovian environments, enhancing quantum coherence control.

Findings

Moving qubits maintain entanglement better than stationary ones.

Velocity tuning can protect entanglement against noise.

Results are applicable to cavity-QED systems and scalable to many qubits.

Abstract

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