Yanqiang Guo, Jie Li, Tiancai Zhang, Mauro Paternostro
The transfer of entanglement from optical fields to qubits provides a viable approach to entangle remote qubits in a quantum network. In cavity-quantum electrodynamics, the scheme relies on the interaction between a photonic resource and two stationary intra-cavity atomic qubits. However, it might be practically hard to trap two atoms simultaneously and synchronize their coupling to the cavities. To address this point, we propose and study entanglement transfer from cavities driven by an entangled external field to controlled flying qubits. We consider two exemplary non-Gaussian driving fields: NOON and entangled coherent states. We show that in the limit of long coherence time of the cavity fields, when the dynamics is approximately unitary, entanglement is transferred from the driving field to two atomic qubits that cross the cavities. On the other hand, a dissipation-dominated dynamics leads to very weak quantum correlated atomic systems, as witnessed by vanishing quantum discord.
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http://arxiv.org/abs/1206.3477
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