Spin-based quantum systems are among the best sensors in terms of sensitivity and spatial resolution for a variety of physical properties. A key factor to broaden the range of applications is the control over the microwave field used to manipulate the quantum system. We present the implementation of a transparent microwave conductor, suitable for optical read-out of a spin-based quantum sensor. For this, the interaction of an indium tin oxide (ITO) strip line on diamond with nitrogen vacancy centres was investigated. The amorphous ITO can be fabricated at room temperature, has a transmittance larger than 80% in the visible spectrum and a low resistivity. We show that these strip lines are completely scalable which enables highly homogeneous microwave fields from the nanometre up to the millimetre scale. ITO structures can therefore serve as excellent transparent microwave conductors, widening the current use of spin-based quantum sensors.

就各种物理特性而言，基于自旋的量子系统在灵敏度和空间分辨率方面均是最好的传感器之一。扩大应用范围的关键因素是对用于操纵量子系统的微波场的控制。我们介绍了一种透明微波导体的实现方式，该导体适用于基于自旋的量子传感器的光学读出。为此，研究了金刚石上的铟锡氧化物（ITO）带状线与氮空位中心的相互作用。非晶ITO可以在室温下制造，具有在可见光谱中大于80％的透射率和低电阻率。我们证明了这些带状线是完全可扩展的，从而可以实现从纳米级到毫米级的高度均匀的微波场。