Quantum Gates and Circuits

Abstract

A historical review is given of the emergence of the idea of the quantum logic gate from the theory of reversible Boolean gates. I highlight the quantum XOR or controlled NOT as the fundamental two-bit gate for quantum computation. This gate plays a central role in networks for quantum error correction.

Latex, 18 pages, 12 figures. For the Proceedings of the ITP Conference on Quantum Coherence and Decoherence, December, 1996, Proc. R. Soc. London A

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