QKD Introduction:

                  Quantum key distribution is a technique that uses the fundamental laws of quantum mechanics in order to achieve security key and also to ensure security. This QKD Security Seminar Report is also called as QKA that is the Quantum key Agreement. Generating a private key in more number between the two parties or among a public channel that is not secure is the main aim of QKD protocols. The single condition for the QKD protocols is the error rate must be less than the actual threshold then the information of the quantum will be communicated over a public channel. In order to enable secure communication between the authorized parties a resultant key is utilized, this is to establish a “conventional private key cryptosystem”.

                                The Seminar Report of Quantum key distribution is developed first by Bennett and Brassard in the year 1984 and that protocol is called as BB84 protocol. The development of QKD has extended to the free space systems and optical fiber system. In the year 2000, G.L Morgan has reported the use of QKD in a 48 km distanced optical fiber network. This is developed in a better way in the year 2002 by theUniversityofGeneva; this development is usage of QKD in the 67 km distanced of optical fiber network. This attempt was done successfully. In the year 2003, Guo’s group has developed a QKD in the 14.8 km special network of optical fiber, and this distance was expanded in a great range for the year 2004. Later it is also reported that in a 50 km optical fiber network. QKD can stay constant for six years.

The Zeng’s group has demonstrated a quantum communication practically in a local area network using the TCP protocol.  Japanese researchers have done many advanced researches and accomplished a single photon interference experiment for the quantum cryptographic system along 100km distance. This experiment is done using a balanced “gated-mode photon detector”. N.Gisen has developed solutions for the problems of chromatic dispersion using the constant fiber quantum channel along 30km distance for using the energy based entanglement based on the quantum key distribution. 

This Paper is written & submitted by Vamshidhar A.