Review of quantum key agreement

• 1、School of Science, Beijing University of Posts and Telecommunications, Beijing 100876

Abstract：Information security is a problem that almost everyone has to face today.As an effective means to protect information security, cryptography has been paid attention by all circles.In recent years, with the birth of quantum computer, quantum cryptography has gradually come into people\'s vision, and has been a rapid development.Quantum key Protocol (QKA), as an important branch, has attracted extensive attention.Since Zhou et al. proposed the first EPR pair based QKA protocol in 2004, researchers have made a lot of improvements to QKA in just a few decades, which has effectively solved the information security problem at the quantum level, laying a foundation for the large-scale realization of quantum communication in the future.In order to facilitate the subsequent learning of relevant knowledge, this paper briefly summarizes the development trend and challenges of quantum key protocol in recent years, hoping to promote the research and development of quantum cryptography.

Keywords： Quantum Cryptography Quantum Secret Key Distribution Protocol Multi-party Quantum Secret Key Negotiation Bell State