A universal quantum network coding method based on entanglement-free cloning

Abstract

Provided is a general quantum network coding method based on non-entanglement clone. The general quantum network coding method based on the non-entanglement clone comprises six steps: step (1), defining the nodes of fundamental types, wherein the nodes comprises 5 node types of source nodes, fork nodes, transmission nodes, cluster nodes and sink nodes; step (2), defining reduced conditions of a quantum network coding protocol; step (3), adopting a conversion scheme from a general graph to a D3 graph to obtain a new graph based on the D3 graph; step (4) further simplifying the protocol, and unifying the algorithm of coefficient parts as the algorithm of adding the transmission nodes; step (5), determining the overall sequence of v1, v2,..., vr according to node degrees in the graph, wherein the r is the number of all the nodes; step (6) carrying out specific operation on each node of the graph. According to the general quantum network coding method based on the non-entanglement clone, the non-entanglement approximate clone is adopted to achieve the copy link of quantum network coding, compared with pre-shared entanglement clone achieving the fact that transmission fidelity of quantum states is 1, the method is more suitable for information transmission of general graph models, low resource price is needed, and the method is easier to achieve.

Description

technical field [0001] The invention relates to a universal quantum network encoding method based on entanglement-free cloning, which belongs to the technical field of communication networks. Background technique [0002] Network coding has completely changed the way of information processing and transmission in communication networks, overturning the traditional concept that processing transmitted data at intermediate nodes will not have any benefits, and is a major breakthrough in the information field. The academic community believes that network coding is an important and effective means to solve network transmission bottlenecks. Based on the characteristics of high efficiency and absolute security of quantum communication, extending network coding to the field of quantum communication will help solve the bottleneck problem of quantum communication transmission, and has a new application prospect. [0003] Compared with the study of classical network coding, quantum net...

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Problems solved by technology

[0004] Although the use of pre-shared entangled states can achieve perfect transmission on the butterfly network model, that is, the transmission of quantum states with a fidelity of 1, the mixed transmission mode of quantum channels and classical channels used in the pre-shared entangled state scheme is not conducive to quantum Actual Deployment of the Network

In a large-scale network or a general graph model, the condition for pre-sharing two pairs of maximum entangled states between any two senders is relatively harsh and the cost is too high, so the pre-shared entangled state scheme is not suitable for large-scale networks and Information transfer over general graph models

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