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Distance measures to compare real and ideal quantum processes

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arxiv quant-ph/0408063 v2 pith:O3KHVOZA submitted 2004-08-10 quant-ph

Distance measures to compare real and ideal quantum processes

classification quant-ph
keywords distancemeasuresquantumcomparecriteriainformationmeasureprocessing
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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With growing success in experimental implementations it is critical to identify a "gold standard" for quantum information processing, a single measure of distance that can be used to compare and contrast different experiments. We enumerate a set of criteria such a distance measure must satisfy to be both experimentally and theoretically meaningful. We then assess a wide range of possible measures against these criteria, before making a recommendation as to the best measures to use in characterizing quantum information processing.

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Cited by 2 Pith papers

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

  1. On estimating operator norm distance, with optimal trace distance estimation when one state is pure

    quant-ph 2026-07 accept novelty 7.0

    Rank-independent quantum estimators achieve Θ(1/ε) queries for operator-norm (and trace) distance when one state is pure, and Õ(1/ε^{3/2}) queries for general states, proving BQP-completeness.

  2. Multi-Qubit Dyadic Phase Fixing for Fault-Tolerant Quantum Compilation

    quant-ph 2026-06 unverdicted novelty 6.0

    Dyadic Phase Fixing reduces T-count by up to 70% versus gridsynth in quantum circuit compilation for fault-tolerant computing via numerical synthesis and automatic phase register sizing.