Biograph: He is a professor at Tsinghua University, fellow of IoP and fellow of APS, President of Associations of Asian Pacific Physical Societies. He received his B.Sc. from Shandong University in 1982, and Ph.D. from Tsinghua in 1987 respectively. He is the founder of quantum secure direct communication, and duality quantum computing formalism.
Title: Practical Quantum Secure Direct Communication
Abstract: Quantum communication offers provable security of communication. Quantum secure direct communication (QSDC) is one of the important branches of quantum communication. In contrast to other branches of quantum communication, it transmits secret information directly. Recently, remarkable progress has been made in proof-of-principle experimental demonstrations of QSDC. However, it remains a technical feat to bring QSDC into a practical application. Here, we report the recent progress of practical quantum secure communication. First, the security of QSDC has been analyzed in the Wyner wiretap channel theory. The secure and reliable direct communication is achieved by using a specially designed concatenated low-density parity-check (LDPC) code in combination with universal hushing families. A protype set up was completed in 2018 with a repetition rate of 1 MHz at a distance of 1.5 kilometers and achieved secure communication rate is 50 bps. Very recently, a secure communication rate of 4 k bps at a distance of 10 kilometers is achieved. The problem of impractical quantum memory was solved by designing a quantum memory-less QSDC protocol using delayed coding. With these developments, QSDC is ready to go to practical applications.