本项目将依托上海师范大学主导的LCT亚毫米波天文探测望远镜，在继承其已有的0.18~0.72THz的探测技术基础上，开展基于高能隙材料NbTiN、NbN的高频超导SIS混频器的关键技术研究，拓展望远镜的观测频率范围。高频信号的观测在天文研究上具有重要意义。例如探测1THz频率的信号可以了解位于恒星原始尘埃和气体盘空隙中巨大行星的诞生与成长，对于阐明行星盘的内部结构和演化非常关键。通过制备高能隙超导隧道结，进行信号耦合回路和量子混频特性的数值模拟和实验表征，深入理解高频波段的信号传输与混频性能，力争获得在1THz频段的噪声温度达到5倍量子极限的超导SIS混频器。本项目将为挖掘和扩充LCT望远镜的探测能力打下关键技术基础，为我国亚毫米波天文探测技术开发提供验证平台。

This project will rely on the LCT sub-millimeter wave astronomical detection telescope led by Shanghai Normal University and carry out the key technology research of superconducting SIS mixer with high energy gap materials NbTiN and NbN on the basis of inheriting its existing detection technology of 0.18 ~ 0.72 THz, so as to expand its observation frequency range. The observation of high-frequency signals is of great significance in astronomical research. For example, detecting the signal of 1 THz can understand the birth and growth of giant planets located in the space between the original dust of the stars and the gas disk, which is important to clarify the internal structure and evolution of the planetary disk. By preparing a high-energy gap superconducting tunnel junction and carrying out numerical simulation and experimental characterization of its signal coupling loop and quantum mixing characteristics, we intend to understand the signal transmission and mixing performance in the high-frequency band and strive to obtain a superconducting SIS mixer with a noise temperature of 5 times the quantum limit in the 1 THz band. This project will lay a key technical foundation for excavating and expanding the detection capabilities of the LCT telescope, and provide a verification platform for the development of submillimeter wave astronomical detection technology in China.