Multiple-Bell-Bases Parallel Quantum Key Distribution Using Feedback

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 distribution) bit rates are increased, which provides novel approaches for the algorithm designs of high-speed quantum secure communications and QKD networks.

Keywords:

Feedback control, multiple Bell bases, parallel quantum key distribution, quantum communication, quantum cryptography, quantum entanglement.