Abstract
We investigate hybrid flux-nitrogen-vacancy (NV) entanglement in the system consisting of two flux qubits and an NV-center ensemble (NVE). The influence of the initial entanglement degree of the flux qubit C, the coupling strength between two flux qubits, the coupling strength between the flux qubit M and the NVE on the bipartite entanglement and the tripartite entanglement is discussed. The maximally bipartite entangled state and the maximally tripartite entangled state can be obtained under certain conditions. In addition, it is shown that the time of disentanglement of the hybrid quantum system can be controlled by adjusting the coupling strength between two flux qubits and the coupling strength between the flux qubit M and the NVE.
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