Quantum Key Distribution Method in Quantum Networks

A quantum key distribution (QKD) method has been presented for obtaining the cryptographic key to encode the information communicated between the legitimate parties. It is used to demonstrate and secure the quantum networks. It is utilize to share the secured keys between a plurality of transmitters and a plurality of receivers. It is a QKD system that generates the first signals with different phases or polarization and the second signals with different frequencies and delay time. The transmitter sends the two signals to share the key with receiver. The key is formed by the states of the first and second signals. The method leads to increase the length of the shared key. The first signal is generated in different phases or polarization to protect the transmission channel and to be the reference time for second signal. Secure keys generated by the QKD network are managed in the key management layer by key management agents (KMAs), and used to encrypt the data and send it to receivers. The proposed schemes aimed to provide a secure end to end communication.