Abstract
There is a problem that some eavesdropping risks exist in PQKD (Parallel Quantum Key Distribution) systems for the same types of quantum channels. Using the method of adjusting measure bases, a scheme of MBB (Multiple-Bell- Bases)-PQKD is proposed based on the principle of feedback controls. In this scheme, the sample spaces of Bell bases are changed constantly to increase the difficulty for eavesdropper to steal quantum keys. The analyses results demonstrate that the eavesdropping risks in parallel quantum channels are reduced by feedback controls, and the QKD (quantum key dis- tribution) bit rates are increased, which provides novel approaches for the algorithm designs of high-speed quantum se- cure communications and QKD networks.
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