Renxi Feng, the Key Laboratory of Quantum Information of the Chinese Academy of Sciences, led by Academician Guo Guangcan of the China University of Science and Technology, cooperated with Professor Dao Dao of Zhejiang University. He successfully developed the silicon-based conductive film quantum integrated chip for the first time. They used different silicon nano-waveguides in silicon photonic integrated chips. The energy transfer mode, as a new dimension of quantum information coding, realizes the coherent transition between single photon states and quantum entanglement states in polarization, path, and waveguide modes, and the interference visibility is more than 90%, which is an integrated quantum. The manipulation and conversion of photons with multiple degrees of freedom on the optical chip provide important experimental evidence. The results were recently published in the UK's "Nature and Communications" magazine. Compared with free space optics and fiber optics, integrated optics devices and systems have many advantages such as small size, scalability, low power consumption, and high stability. In the past research of integrated quantum optical chips, polarization degrees of freedom or path degrees of freedom were generally used, ie, quantum information encoding was achieved using different polarizations or different paths. Among them, polarization coding can only realize the two-dimensional quantum information process, and can not achieve high-dimensional coding. Therefore, there are obvious shortages in information capacity and security. Although path coding can realize high-dimensional quantum information process, it is in order to prevent different path information between The crosstalk between the paths is usually large, which greatly restricts the integration and enhancement of the quantum optical chip. Ren Xifeng's research group and collaborators proposed for the first time the use of multiple eigenmodes of waveguides in wide waveguides as new degrees of freedom for encoding quantum information. Using a multimode waveguide supporting multiple waveguide modes, it is hoped that high-dimensional encoding of quantum information will be achieved. In particular, these modes do not interfere with each other during transmission, effectively avoiding the problem of information crosstalk. At the same time, multiple degrees of freedom of photons can also be used in the quantum information process to significantly increase the information capacity. Using the new waveguide mode converter and waveguide mode multiplexer on silicon substrates, they successfully implemented arbitrary coherent conversion between polarization, path, and waveguide mode freedom, laying an important foundation for achieving high-dimensional quantum information processing in integrated quantum optical chips. . (Reporter Wu Changfeng) Knitting Machine Parts,Circular Knitting Machine Parts,Knitting Machine Spare Parts,Knitting Parts Changzhou Longfu Knitting Co., Ltd. , https://www.czcircularmachine.com