研究了二阶磁梯度诱导的纳米金刚石氮空位(NV)色心耦合机械振子系统中两机械模式与NV色心的纠缠动力学特性,分析了系统相干角、机械模式的衰减率、NV色心的自发衰减率等对纠缠的影响。研究结果表明,选择合适的系统参数可以制备机械模式和NV色心之间的最大纠缠态;相干角对系统的纠缠动力学特性具有重要影响,当耗散存在时,通过控制相干角可以有效调节系统抵抗纠缠衰减的能力;相比于NV色心的自发衰减,机械模式的衰减使系统纠缠更快衰减和消失。

The entanglement dynamic properties between two mechanical modes and nitrogen-vacancy(NV) centers in the system of second-order-magnetic-gradient induced nanodiamond NV center coupled to mechanical resonator are investigated. The influences of coherence angle, decay rate of mechanical modes and spontaneous decay rate of NV centers on entanglement are analyzed. The research results show that the maximum entangled state between mechanical modes and NV centers can be produced by the suitable choice of system parameters. In addition, the coherence angle has an important influence on the entanglement dynamics, and the coherence angle can be used to effectively adjust the resistance ability to entanglement attenuation when dissipation is considered. Moreover, compared to the spontaneous decay of NV centers, that of mechanical modes can make the system entanglement decay and disappear more quickly.