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Both Toffoli and Controlled-NOT need little help to do universal quantum computation

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arxiv quant-ph/0205115 v2 pith:2XDVICGS submitted 2002-05-18 quant-ph

classification quant-ph
keywords gatequantumuniversalcontrolled-notgatesonlysingle-qubitbasis
verification ladder T0 review T1 audit T2 compute T3 formal
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What additional gates are needed for a set of classical universal gates to do universal quantum computation? We answer this question by proving that any single-qubit real gate suffices, except those that preserve the computational basis. The result of Gottesman and Knill[quant-ph/9807006] implies that any quantum circuit involving only the Controlled-NOT and Hadamard gates can be efficiently simulated by a classical circuit. In contrast, we prove that Controlled-NOT plus any single-qubit real gate that does not preserve the computational basis and is not Hadamard (or its alike) are universal for quantum computing. Previously only a ``generic'' gate, namely a rotation by an angle incommensurate with pi, is known to be sufficient in both problems, if only one single-qubit gate is added.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Quantum Computer Benchmarking: An Explorative Systematic Literature Review

    quant-ph 2025-09 conditional novelty 6.0 of 10

    A systematic review of 329 quantum benchmarking studies yields a stack-aligned taxonomy and definitions for hardware-, software-, and application-focused benchmarks.

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