The Study Of Some Problems In Quantum Direct Communication

It as a direct theoretical basis of quantum optics, quantum electrodynamics, quantum information theory, quantum electronics and other disciplines, and involves computing and communications field, the field of laser and photonics, the field of space (such as artificial communication satellites), the field of atomic physics, and solidthe field of physics and semiconductor physics, photon and electron carrier information, relying on energy, and to explore the formation of quantum information (especially light quantum information and quantum electronics, quantum information), delivery, transmission, receiving, extraction, identification, processing, control and its best application in the relevant scientific and technological fields, etc. With the rapid development of science and technology, information and efficient, safe and accurate transmission has been widely concerned. Whether it is in the field of national defense or economic areas of the user always want their information safe, fast and error is passed to the recipient, quantum information science is to grow up in this context. Whether it is in the field of national defense or economic areas of the user always want their information safe, fast and error is passed to the recipient, quantum information science is to grow up in this context. In this great progress, achievement is most critical to the recently proposed quantum secure direct communication. The development of quantum communication technologies along with the deepening of theoretical research and development of hardware technology has made unprecedented achievements in the communication process, how to make the information in the communication between the two sides safe, accurate and efficient transmission core technology of communication technologya.Quantum communication is a combination of classical information theory and quantum mechanics emergence of a new means of communication. By means of quantum physical characteristics of quantum communication is expected to break through the bottleneck of the information system. Today quantum communication consists mainly of quantum teleportation, quantum dense coding, quantum secret sharing, quantum key distribution, and several other important part. Quantum secure direct communication is an important branch of quantum communication, its basic principle is that both sides share in the entangled state quantum channel, then the sender with different unitary operations to define his information to be sent, sent in accordance with itsthe different opponents particles corresponding unitary transformation. Based on the nature of the struggle, any of the unitary operations inevitably lead to corresponding changes in the hands of the recipient particles. Eventually, the recipient uses the corresponding measurement-based measurements, thus confirming the sender by the unitary operation types, namely access to secret information sent by the sender, which is the so-called quantum secure direct communication. In this article, we state for the six-particle-based Cluster communication channel, and channel safety inspection particle GHZ state; final maximally entangled state to measure, derived by comparing the measurement results with the control protocol to be transmitted secret information. In my quantum safety reports, legal reporting parties Bob and Charlie by a unitary transformation to send their secret report news to their boss (Alice), as well as on the six particles Cluster state and a Bell state transform the struggle to achieve. Compared our protocol with some communication protocol in terms of security theoretically up to100%. And transmission channel capacity on the6bit the quantum information can be transmitted a4bit classic. So on the information capacity has been greatly improved.