Abstract: Quantum cryptography is a modern technique in networking which is used as a component in making networks secure. Network security is a major problem in Telecommunication data Preservation. The storage of call detail records (CDRs) of telephony and internet traffic and transaction data (IPDRs) which are from governments and commercial organizations. It is often argued that data retention is necessary to combat terrorism, and other crimes. Data retention may assist the police and security services to identify potential terrorists and their accomplices before or after an attack has taken place. With the use of quantum cryptography and Wavelength division multiplexing provide security by enabling the unconditionally secure transmission of a random binary key, which enable bi-directional communication as well as multiplication of signal capacity. This may useful to compress several request to a single wave via fiber optics. And capable of protecting bandwidth capacity. Proposed research is about how to ensure the security of telecommunication call detail record transactions with quantum key distribution, wavelength division multiplexing and ultrafast frequency combs.