Quantum Teleportation And Quantum Super Dense Coding Via W State And W-class State

Quantum teleportation and quantum super dense coding are two important applications in quantum information theory, which are also applications in quantum entanglement phenomenon. This thesis mainly discusses quantum teleportation and quantum super dense coding scheme based on W state, W-class state and 5-particle state channel.In the second chapter, we summarize some basic theoretical knowledge of quantum informatics. In the third chapter, we emphatically discuss quantum teleportation of arbitrary single particle based on W and W-class state channel. The results show that the probability of successful quantum teleportation is 100% when there is no controller, whereas the quantum teleportation is probabilistic when there are controller, and we gives the probability of success. In the fourth chapter, we put forward controlled dense coding scheme based on W state and 5-particle state. The controller can control information between sender and receiver by adjusting the measuring angle.