Quantum network coding method based on quantum discord

Abstract

The invention discloses a quantum network coding method based on quantum discord. Characteristics of the quantum discord are brought into full play, entanglement distribution based on the separated state is combined, and the quantum network coding method based on the quantum discard is designed, thus the quantum resource consumption of the entanglement distribution is reduced, and the robustness and the throughput of a communication network are improved. Compared with the prior art, the quantum network coding method based on the quantum discard provided by the invention has the following advantages: (1), the quantum discard is adopted as a measure of quantum correlation to perform the entanglement distribution from the perspective of taking the quantum correlation as a communication resource, thereby reducing the quantum resource consumption of the entanglement distribution and improving the robustness and the throughput of the communication network; and (2), the quantum network codingmethod is designed by adopting the entanglement distribution based on the separated state, no quantum entanglement is involved in an entanglement establishment process, and an entangled particle pairis generated between a source node and a destination node only at the end, so that the advantages of the quantum invisible transmission state in the aspect of information transmission are fully exerted.

Description

technical field [0001] The invention relates to a quantum network coding method based on quantum detuning, belonging to the technical field of communication networks. Background technique [0002] Quantum network coding is a key technology to improve the transmission efficiency of quantum communication networks. Although the basic idea of ​​quantum network coding is roughly the same as that of classical network coding, the special physical properties of quantum make quantum network coding have many new features. For example, the quantum non-cloning theorem in quantum information theory makes it impossible to realize broadcast and multicast losslessly in quantum communication networks. On communication network nodes, the replication of unknown quantum states must be achieved by sacrificing fidelity. Since the Schrödinger equation is a typical time-reversible equation, any quantum operation in quantum mechanics is reversible. For some irreversible logical operations, such a...

AI Technical Summary

Problems solved by technology

Although many protocols using quantum correlation as a communication resource have been proposed, it is still far away from realizing the goal of using only quantum correlation to achieve lossless transmission of quantum states without using quantum entanglement.

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