Research On Bidirectional Quantum Teleportation Of Two-particle State Based On GHZ Entangled State

quantum informatics is a new discipline that connects quantum mechanics and information science.It has many advantages that classical informatics can not surpass,and using its quantum properties can solve many problems in the transmission of classical information.Quantum communication is an extremely important branch of quantum informatics,and mainly focuses on quantum teleportation,quantum dense coding and quantum cryptography.In this paper,we mainly study the direction of quantum teleportation,It relies on the principles of entanglement,uncertainty and non-clonality to ensure that information is securely delivered to recipients,there is no need to consider whether the amount of information to be transmitted is too large,the amount of resources consumed is excessive,It adds a lot of advantages over traditional methods of communication,So it attracted a lot of researchers eyes.At present,a lot of schemes have been proposed for quantum teleportation.After introducing the background of quantum informatics,the theoretical and experimental research of quantum teleportation and its research value,in the existing schemes,in this paper,we choose two relatively simple single-particle state and one asymmetric quantum teleportation schemes to analysis and introduce.On the basis of the above schemes,this paper proposes a scheme of bidirectional quantum teleportation of two-particle state based on Greenberger-Home-Zeilinger(GHZ)entangled state.The scheme uses entanglement exchange to make a pair of three-particle GHZ state as a quantum channel shared by both communication parties,first,the sender and the receiver take c-not operation and single-qubit measurement on their particles,and inform the measured results to each other.Then two sides of communication can make appropriate unitary operation according to the obtained results,they can reconstruct the quantum state transmitted by each other and realize bidirectional quantum teleportation of two-particle states.At the same time,it is known that the quantum channel of this scheme is more easier to prepared and transmitted efficiently,the corresponding measurement operation is also simple and convenient.During the implementation of this scheme,it is necessary to ensure that the sender and the receiver can cooperate closely to realize the normal transmission of unknown quantum states,this type of communication is safer and more reliable than the traditional communication.