在基于NV量子信息实验台上,我们需要对金刚石NV色心施加特定序列的微波射频脉冲信号。为了将特定序列的微波射频脉冲信号作用在样品上,我们利用具有损耗低、无截止频率等特点的槽线设计了一种新型平面电路辐射结构,能够将经过调制的微波射频脉冲信号转化为交变微波场,并作用在金刚石NV色心上,进而实现量子态调控。本设计基于的原理是利用传统槽线作为主传输线,T型槽线作为功分结构,Ω型圆环作为辐射结构,将主传输线中的一部分功率流馈入Ω型圆环内,辐射出较强的微波场。对比传统的光刻微纳工艺方法,本设计利用激光刻蚀及电化学镀铜工艺方法实现了辐射结构的低成本制作。通过网络分析仪等仪器设备测试后,该辐射结构目前已应用到基于NV量子信息实验台中,在高频28 GHz和低频71 MHz工作频率附近分别取得了约448 Gauss和4849 Gauss大小的交变磁场。

On the NV-based quantum information lab bench,we need to apply a specific sequence of microwave RF pulse signals to the diamond NV center.In order to apply a specific sequence of microwave RF pulse signals to the sample,we use a slotline with the characteristics of low loss and no cutoff-frequency to design and implement a planar circuit radiation structure,which can efficiently modulate the microwave RF pulse signal into a microwave field and act on the diamond NV center to realize quantum state regulation.The design is based on the principle that the traditional slotline is used as the main transmission line and the T-shaped slotline is used as the power division structure,and the Ω-type ring is used as the radiation structure.A part of the power flow in the main transmission line is fed into the Ω-type ring to obtain a strong microwave field. Compared with the traditional lithography micro-nano process,this design uses the laser etching and electrochemical copper plating processes to achieve low-cost fabrication of the radiation structure.After testing by instruments such as network analyzer, the radiation structure has been applied to the NV quantum information test bench, and the alternating magnetic fields of about 4.48 Gauss and 48.49 Gauss are respectively obtained near the high frequency 2．8 GHz and low frequency 7.1 MHz operating frequencies.