Photonic Secure Quantum Communication

Abstract

This dissertation demonstrates the importance of quantum encryption for unconditioned secure communication. The dissertation consists of four chapters organized as follows: Chapter One: The chapter begins with an introduction on the history of data transfer, data security and the history of cryptography. In addition, the problems of classical encryption have been discussed and the way to defeat them using quantum cryptography. Chapter Two: In this chapter, physics and concepts behind quantum cryptography and the different protocols that have been proposed to serve this idea. Limitations of the quantum techniques have been showed. the mathematical descriptions of those phenomena and techniques have been studied as well. Chapter Three: In this chapter, new ideas have been proposed to generalize the quantum encryption techniques, to be able for deployment over practical multi-site networks, rather than working only over point to point case study as in literature. Chapter Four: complete modeling and simulation for the QSDC system have been done successfully. Proposing decoy state technique as an enhancement to the conventional systems, comparison has been done between the results of the proposed system and the conventional one from security point of view and system performance (information capacity). Chapter Five: In this chapter Conclusions are drawn and future work based on this work is suggested.