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Computation with Unitaries and One Pure Qubit

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arxiv quant-ph/0608132 v2 pith:O53KHFCK submitted 2006-08-17 quant-ph

classification quant-ph
keywords classcomplexityproblempurequbitsomeassociatedclasses
verification ladder T0 review T1 audit T2 compute T3 formal
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We define a semantic complexity class based on the model of quantum computing with just one pure qubit (as introduced by Knill and Laflamme) and discuss its computational power in terms of the problem of estimating the trace of a large unitary matrix. We show that this problem is complete for the complexity class, and derive some further fundamental features of the class. We conclude with a discussion of some associated open conjectures and new oracle separations between classes.

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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. Simultaneous Estimation of Nonlinear Functionals of a Quantum State

    quant-ph 2025-05 conditional novelty 8.0 of 10

    Estimating k powers of a quantum state against one observable simultaneously costs Θ~(k) samples, matching the cost of the single hardest term.

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