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 a Brown state and network coding. According to the bidirectional single-bit state preparation method, state preparation based on the Brown state and network coding are combined for the first time, cross transmission is carried out between a sender and a receiver through a butterfly network and a five-bit Brown state, and an arbitrary single-bit quantum state scheme is prepared bidirectionally. The bidirectional single-bit state preparation method is mainly characterized in that a quantum network coding model is established through state preparation on the basis of a butterfly network coding protocol. A channel shared by a source node and a destination node is obtained by adding auxiliary particles in the five-bit Brown state and performing channel modulation through CNOT operation. The transmission of known information in the whole network model is realized, compared with a quantum stealth transmissionscheme, the resource consumption is lower, the transmission efficiency reaches a higher level, the bidirectional preparation is innovatively realized, and the communication capacity reaches four bitsper round. The bidirectional single-bit state preparation method has a wide application prospect in the technical field of quantum communication networks.

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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