| As a new discipline formed by the intersection of quantum physics and information science,quantum information science has achieved fruitful results both in theory and experiment.Quantum communication is an important branch of quantum information science.It uses quantum states as a carrier to transmit information and uses the unique physical properties of quantum to ensure the security and efficiency of communication.Quantum communication has continued to make breakthroughs and advancements from single-photon communication to communication using the entangled properties of quantum.As the main research content of quantum communication,quantum remote state preparation is an important part of realizing quantum communication,quantum network,and quantum computation.With the continuous success of the preparation of multi-particle entanglement sources,the use of multi-particle entangled states for information transmission has become a trend.Due to the diversity of multi-party communication modes,the use of multi-particle entangled states for information transmission requires reasonable scheme design and feasibility analysis to achieve efficient information transmission.However,with the deepening of research,people found that the entanglement source is not easy to save,and in the process of communication,the entangled state is decoherent due to the influence of the channel noise and the environment,making the quantum state a mixed state or a partially entangled state.For partially entangled states,there are generally two solutions,one is to extract the entangled state from the partially entangled state,and the other is to directly use the partially entangled state for communication.In this paper,directly using partially entangled states as quantum channels,a multi-party quantum information transmission mode based on quantum remote preparation is proposed.Specifically,the research results obtained are as follows:1.Using partially entangled states as quantum channels,quantum broadcast and multicast schemes based on remote state preparation are proposed.In the quantum broadcast scheme,the quantum information transmission with the participation of the four parties is used as the application scenario of the scheme,and the feasibility of the scheme is verified by projection measurement and joint unitary transformation,and the success probability of the scheme is obtained.Taking into account the particularity of quantum broadcast and the requirements of information transmission diversity,the broadcasting scheme is promoted and a more general quantum multicast scheme is proposed.Broadcast and multicast schemes are aimed at the situation of one sender and three receivers.As the number of information receivers continues to increase,the complexity of the program is also increasing.The trend of the complexity of the scheme is reflected by analyzing the increase in the number of particles in the entangled channel and the transformation trend of the unitary matrix order.2.In view of the limited participants and the limitation of single quantum state transmission in the above scheme,a new quantum information transmission scheme is proposed to adapt to more general information transmission scenarios.In this scenario,there are(N + 1)parties involved in information transmission,and the sender and receiver can simultaneously transmit the GHZ state of any particle.For this information transmission scenario,two different schemes are proposed.In the first scheme,the feasibility of the scheme is verified by projection measurement and joint unitary transformation.In the second scheme,on the basis of projection measurement and joint unitary transformation,the CNOT gate is introduced,which simplifies the number of particles in the quantum channel and makes the scheme easier to implement in industry.In the end,apply these two schemes in a specific information transmission scene,and compare the similarities and differences and advantages and disadvantages of the two schemes. |
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