Bidirectional single-bit state preparation method based on brown state and network coding

Abstract

The invention discloses a bidirectional single-bit state preparation method based on Brown state and network coding. The present invention combines state preparation based on the Brown state with network coding for the first time, cross-transmits from the sender to the receiver through the butterfly network and the five-bit Brown state, and prepares any single-bit quantum state bidirectionally. Mainly The feature is: on the basis of the butterfly network coding protocol, the quantum network coding model is established through state preparation. The channel shared by the source node and the destination node is obtained by channel modulation through the CNOT operation with five-bit Brown states plus auxiliary particles. Realize the transmission of known information in the entire network model. Compared with the quantum teleportation scheme, the resource consumption is less, and the transmission efficiency reaches a higher level. It also innovatively realizes two-way preparation, and the communication capacity reaches four bits per round. . It has broad application prospects in the field of quantum communication network technology.

Description

technical field [0001] The invention relates to the field of quantum communication, in particular to a bidirectional single-bit state preparation method based on Brown state and network coding. Background technique [0002] In 2000, Ahlswede et al. found a new way to achieve better network communication performance than before in the basic article of Network Coding. The main idea of ​​network coding is that we can encode information at intermediate nodes in the network, thereby improving throughput, security and reducing network complexity. With the development of quantum information, network coding has been gradually applied to quantum networks. Quantum network coding (QNC) has gradually become a major research area due to its ability to improve the security and efficiency of quantum communication. Since 2006, Hayashi et al. explored the possibility of quantum network coding and proposed the first quantum network coding protocol XQQ. By designing the XQQ protocol, they s...

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Problems solved by technology

[0004] Based on the idea of ​​quantum network coding, the most common application is the combination with teleportation (QT), and the preparation of known states has always been a popular research object in the field of quantum communication. It has been gradually proposed, but few ideas based on quantum network coding have been implemented. Quantum remote state preparation (RSP) has the same goal as teleportation. Their goal is to send a target to a distant place.

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