Abstract:

Considering the reliable broadcast communication problem of quantum network nodes in the environment with complicated information channels, the error control issue of this problem was investigated. A communication protocol with broadcast error control for quantum networks was proposed based on forward error correction. For networks containing N+1 quantum nodes, the error counts of N slave nodes are calculated respectively when the master node sends quantum information to N slave nodes, that determine that the slave nodes are retained in or removed from the information list according to the calculated error counts. For states of those retained slave nodes, the errors of bit flips and phase flips of the remaining slave nodes were corrected using the intrinsic characteristic of error-correcting code. Due to the different measuring sequences of the N slave nodes, each slave node has different quantum key. The problem of network leak resulted from the leak of single slave node, if all slave nodes have the same quantum key, can be amended. Finally, analyses of throughput efficiency of information channels as well as the protocol security were presented.

Key words: quantum network, broadcast, correct errors, error control