Research On Bidirectional Quantum Teleportation Based On Multiple Particles

Quantum Information is a discipline formed by the intersection of information science and quantum mechanics.Among them,quantum communication is a very important branch of quantum information.It is not only a new communication method,but also a subject intertwined by many fields.Compared with classical communication methods,quantum communication has many irreplaceable advantages,such as high transmission efficiency and absolute security.Quantum teleportation is one of the important technologies for realizing quantum communication.It uses quantum properties such as quantum entanglement and quantum non-clone theorem to realize the secure transmission of information.This paper mainly studies the bidirectional controlled quantum teleportation protocol based on four-particle entangled state and the bidirectional quantum teleportation protocol based on five-particle cluster state.The specific work content is as follows:1.We propose the bidirectional controlled quantum teleportation protocol based on four-particle entangled states.The protocol uses two pairs of Bell states to form four-particle entangled states,which acts as a quantum channel for bidirectional controlled quantum teleportation.Firstly,the two communicating parties(Alice and Bob)can be both the sender and the receiver.They measure the Bell state of the particles in their hands respectively.After the measurement,the results were notified to the other party respectively.With the help of the third party controller,the communication parties perform appropriate unitary operations on the remaining particles according to the measurement results of the other party.Finally,when Alice is the sender and Bob is the receiver,Alice can send any single-particle state to Bob.At the same time,when Bob is the sender and Alice is the receiver,Bob can also send any single-particle state to Bob.Alice,and then ensure the smooth completion of the bidirectional controlled quantum teleportation process.Through comparative analysis with other protocols,it can be seen that the transmission efficiency of this protocol is still quite impressive.2.Based on the desire to transmit more information quantum states,an asymmetric bidirectional quantum teleportation protocol is proposed.This protocol uses five-particle cluster states as quantum channels.First,the two communicating parties will share the five-particle cluster state,and perform the corresponding controlled-NOT gate operation on the five-particle cluster state.Then,the two communicating parties performed GHZ state observation and Bell state observation on the particles in their hands in turn,and then the communicating parties passed the measurement results to each other.According to the measurement results,the communicating parties performed the corresponding unitary transformation on the remaining particles in their hands.Finally,when Alice acts as the sender and Bob acts as the receiver,Alice sends the EPR pair to Bob.At the same time,when Bob acts as the sender and Alice acts as the receiver,Bob can also send any single particle state to Alice.Thus,the asymmetric bidirectional quantum teleportation process can be successfully completed.Comparing and analyzing the protocol with other protocols,it can be concluded that this protocol uses less quantum resources,transmits more information,and has better transmission efficiency.