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Quantum Optics for Engineers by F.J. Duarte

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18

Quantum Computing

18.1  Introduction

Quantum computing is a very active field producing many publications and varied perspectives. Here, we have chosen, once again, to follow Feynman’s path given that his contributions are among the earliest in the field and the transparency of his approach is unmatched. Thus, the material presented here is primarily based on Feynman’s paper entitled Quantum Mechanical Computers (Feynman, 1985, 1986). However, further material including additional concepts, not included in the Feynman paper, is also presented.

In the discussion that follows, the term universal computer is applied to traditional transistor-based computers using Boolean algebra executed by logical gates such as AND, OR, NOT, NAND, and NOR. ...

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