Research On Improvement Scheme Of Quantum Security Direct Communication

Quantum cryptography is a new type of security technology that relies on the basic theory of quantum physics to realize information security.Compared with the security description of classical cryptosystem based on mathematical computational complexity,the definition of quantum cryptosystem is safe by quantum entanglement effect.Quantum mechanics such as quantum superposition and quantum properties such as quantum teleportation and quantum non-cloning are guaranteed.Quantum-safe direct communication uses quantum information or quantum operations to load information,and comprehensively utilizes quantum properties and fundamental principles of quantum mechanics.It is a quantum cryptography technology that enables direct transmission of confidential content.Quantum-secure direct communication is feasible in physical principle.Its security principle is similar to the one-time-one-density encryption system.Its theoretical innovation and experimental application are integrated and developed,and a series of achievements have been made,which are related to the classical cryptosystem and quantum key distribution technology.Compared with quantum safety direct communication technology,it has many development advantages and its research significance is quite profound.The work done in this article is as follows:1.Introduce the basic knowledge of quantum communication theory and the basic principles of quantum mechanics,and provide theoretical basis for realizing direct communication of quantum safety.2.The theoretical scheme of quantum security direct communication QSDC is described.The key point is to systematically compare and analyze the three theoretical schemes which are more characteristic in terms of function realization in recent years.Finally,based on the comparison results,the theory of future quantum safety direct communication can be research to forecast the outlook.3.We put forward a modified scheme based on 4-dimension Hilbert space,which mixs Bell state particles and single photons and loads 3 bits on a quantum state in order to improve the coding capacity,the information transmission efficiency and the security in a certain extent.Detailed description of the steps of the program,comparative analysis of its operational process,analysis of the security of the program.