Unconditional security of a K-state quantum key distribution protocol

Quantum key distribution protocols constitute an important part of quantum cryptography, where the security of sensitive information arises from the laws of physics. In this paper, we introduce a family of key distribution protocols which generalize the PBC00 protcol. We compare its key with the well-known protocols such as BB84, PBC00 and generation rate to the well-known protocols such as BB84, PBC0 and R04. We also state the security analysis of these protocols based on the entanglement distillation and CSS codes techniques.