ABSTRACT
This chapter discusses quantum mechanics and certain quantum computing elements are initially. Errors are introduced in quantum computation because a quantum system cannot be completely isolated from its environment. The chapter explores certain quantum algorithms. It aims to develop a formal model of quantum computation via quantum Turing machine. The chapter outlines preliminaries for stating the laws of quantum mechanics. It aanlyses the strengths and drawbacks of the quantum computing paradigm. Quantum communication channels, encoders, and decoders are some of the examples of superoperators. One of the important concepts in quantum computation and communication is that of quantum entanglement. Analogously quantum information theory addresses the problem of optimal communication over a quantum channel. Information theory is the study of communication systems from a probabilistic point of view. Analogous to classical communication theory, quantum communication theory studies the limits of efficient data storage and transmission of quantum information. Quantum cryptography uses the principles of quantum mechanics.
