Quantum security communication eavesdropping detection method based on three-particle W-class state

The invention relates to a quantum security communication eavesdropping detection method based on the three-particle W-class state. In the field of quantum security communication, the security detection efficiency of the existing communication protocol is not very high. In order to improve the eavesdropping detection efficiency in the quantum security communication, particles in the three-particle W-class state are used as detection particles to be randomly inserted into the quantum security communication particle streams for eavesdropping detection. After a receiving party receives all particles, the corresponding detection particles are extracted, the corresponding state detection is carried out, whether the particles are in the original state or not is checked, and in addition, the security analysis is carried out. Through the quantitative analysis on the relationship between the detection probability of an eavesdropping person after the eavesdropping and the eavesdropped information quantity, the advantages of the eavesdropping detection method adopted in the invention are proved.