Quantum information technology is the dominant force to push forward the development and revolution of future information technology and industry. It will influence the whole information industry. Breakthroughs in quantum information science are the key to the development and application of quantum information technology. Currently, quantum information science and technology has entered a new era of profound development and rapid breakthroughs. The sign of a major industrial revolution is emerging. Department of Physics of Tsinghua University is one of the pioneers in quantum information studies in the world, and the department’s research covers areas such as quantum matter and material, quantum computing and communication, quantum metrology and quantum devices and so on. In recent years, the University has strengthened the discipline of quantum information science, and speeded up the recruitment of young talent faculties, so as to enhance China’s research and development capability in quantum information science. For instance, two outstanding young faculty members, Dr Dong Liu from Microsoft Station-Q and Dr. Hao Zhang from Delft University of Science and Technology, have joined the department of physics recently. This has significantly strengthened the fabrication and control capabilities of topological qubit of the department. Gui-Lu Long proposed quantum secure direct communication(QSDC) theory in 2000, which has become one of the three major theories of quantum secure communication. In the last few years, QSDC is developing fast.
Guilu Long, Qikun Xue, Jianhua Lu, Lajos Hanzo et al. proposed a secure repeater quantum network, which is an evolutionary pathway for the quantum internet relying on secure classical repeaters.
Guilu Long’s Group realized a 100 km fiber-based quantum secure direct communication system, paving the way to practical long-distance quantum secure direct communication application.
Guilu Long’s Group experimental demonstrate free-space quantum secure direct communication and it lays the foundation for satellite-based quantum secure direct communication.