QKD protocol based on entangled states by trusted third party

Quantum cryptography is considered a solution for sharing secret information in a secure mode. Establishing a quantum security platform into an exciting system requires a package of stable processes. One of these processes is based on creating a Quantum Key Distribution (QKD) protocol or sharing a secret key. This paper presents a QKD protocol that utilizes two quantum channels to prepare a shared secret key. The first communication channel will be initiated by entanglement states, where the entangled photons will be emitted by a trusted third party. The second communication channel utilizes the superposition states that will be initiated by the one of the communicated parties. Moreover, the protocol produces a string of random qubits after verifying the communicated legitimate parties during entangled state channels. The produced string will reflect the shared secret key between the users.