An Introduction To Quantum Computing Algorithms By: Arthur O Pittenger

Author: Arthur O. Pittenger

In 1994 Peter Shor [65] published a factoring algorithm for a quantum computer that finds the prime factors of a composite integer N more efficiently than is possible with the known algorithms for a classical com- puter. Since the difficulty of the factoring problem is crucial for the se- curity of a public key encryption system, interest (and funding) in quan- tum computing and quantum computation suddenly blossomed. Quan- tum computing had arrived. The study of the role of quantum mechanics in the theory of computa- tion seems to have begun in the early 1980s with the publications of Paul Benioff [6]’ [7] who considered a quantum mechanical model of computers and the computation process. A related question was discussed shortly thereafter by Richard Feynman [35] who began from a different perspec- tive by asking what kind of computer should be used to simulate physics. His analysis led him to the belief that with a suitable class of “quantum machines” one could imitate any quantum system.

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