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Information transfer and fidelity in quantum copiers

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Paper breakdownThe authors' claims, conditions and measurements, as JSON Signed receiptProof this review has not been altered
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P. Deuar, W. J. Munro

Quantum Physics · Submitted 15 Mar 2000

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We find that very different quantum copying machines are optimal depending on the indicator used to assess their performance.

how it is stated · asserted 1.00 read the record →

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arXiv IDquant-ph/0003054 (version 2)
Pith IDVLIPKHXZ, Pith's permanent record of this paper and its review
CitationP. Deuar, W. J. Munro. "Information transfer and fidelity in quantum copiers." arXiv:quant-ph/0003054 (2000). https://pith.science/paper/VLIPKHXZ
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The compiled record

The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 3,575 input tokens.

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.38 · human participants 0.01 · controlled comparison 0.07 · randomized assignment 0.01 · states quantitative result 0.05 · compares with prior results 0.43 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v2. Results and the main claim are underlined; .

We find that very different quantum copying machines are optimal depending on the indicator used to assess their performance. Several quantum copying machine models acting on non-orthogonal input states are investigated, and assessed according to two types of criteria: Transfer of (Shannon) information encoded in the initial states to the copies, and fidelity between the copies and the initial states. Transformations which optimise information transfer for messages encoded in qubits are found. If the message is decoded one symbol at-a-time, information is best copied by a Wootters-Zurek copier.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 We find that very different quantum copying machines are optimal depending on the indicator used to assess their performance. result 0.98 0.94 0.82 asserted 1.00
s1 Several quantum copying machine models acting on non-orthogonal input states are investigated, and assessed according to two types of criteria: Transfer of (Shannon) information encoded in the initial states to the copies, and fidelity between the copies and the initial states. method 0.64 0.89 0.08 asserted 0.97
s2 Transformations which optimise information transfer for messages encoded in qubits are found. result 0.88 0.92 0.11 asserted 1.00
s3 If the message is decoded one symbol at-a-time, information is best copied by a Wootters-Zurek copier. result 1.00 0.80 0.26 asserted 1.00

What kind of paper the classifier reports this is: theoretical result 1.00 · evidence from proof or derivation 0.97.

What was examined, and what was not

sources read
  • arXiv listing abstract v2
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
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  • P abstract
not run
  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

We find that very different quantum copying machines are optimal depending on the indicator used to assess their performance. Several quantum copying machine models acting on non-orthogonal input states are investigated, and assessed according to two types of criteria: Transfer of (Shannon) information encoded in the initial states to the copies, and fidelity between the copies and the initial states. Transformations which optimise information transfer for messages encoded in qubits are found. If the message is decoded one symbol at-a-time, information is best copied by a Wootters-Zurek copier.

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