During the teaching process, if the teacher could take the frontier application of science and technology as the traction, explain the principles of cutting-edge scientific and technological progress in the language of college physics, and shorten the distance between basic courses and cutting-edge applications, the students' interest in learning physics will be promoted and their understanding of basic physics principles will be deepen. Taking quantum key distribution as an example, this paper explains the basic principle of the classical BB84 scheme with the polarization content in college physics, and expounds the actual implementation of this scheme, aiming to show that there is a considerable distance between the theoretical scheme and the actual implementation. In order to stimulate students' interest and enthusiasm for active exploration, the latest research progress and current main research directions in the field of quantum communication are also introduced. This is a pioneering attempt to bridge the fundamental physics theory and frontier technolies, which is worth promoting in college physics teaching in the context of emerging engineering education.

Using quantum weak measurement technology, the very weak interaction can cause significant observation effects. It plays important roles in observing the extreme weak physical effect, quantum parameter estimation, quantum state tomography and so on. It has become a research hotspot in the field of quantum measurement. Based on the Stern-Gerlach experiment as the starting point, this paper explains the physical image of quantum weak measurement by using the knowledge of elementary quantum mechanics, and further introduces the frontier development of related fields. This paper can deepen physics teachers' understanding of quantum weak measurement, which is a frontier physical problem, and also help students to establish a clear physical image. The introduction of cutting-edge technology in the teaching process also helps to stimulate students' interest and enthusiasm for active exploration and further research. This paper aims to build a bridge between basic physics principles and high-tech, which is beneficial for college physics teachers to broaden scientific thoughts and enhance academic taste.