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Limitations on Practical Quantum Cryptography

2000· article· en· 1,212 citations· W1959936891 on OpenAlex· 10.1103/physrevlett.85.1330

Why is this work in the frame?

A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.

Canadian affiliationAn author listed a Canadian institution. This is the only route the usual frame has.

Classifier prediction

metacan-v1-d91a1de5be90

Predictions imitate two machine teachers. Scores are not calibrated prevalence probabilities.

Classifier candidate
Theoretical or conceptualNot applicable
Classifier consensus
Theoretical or conceptualNot applicable
Teacher imitation scores

Codex

Theoretical or conceptual0.957
Not applicable0.085
Bench or experimental0.002
Systematic review0.001
Bibliometrics0.001
Other design0.001
Research integrity0.000
Simulation or modelling0.000
Metaresearch0.000
Meta-epidemiology (narrow)0.000
Scholarly communication0.000
Meta-epidemiology (broad)0.000
Observational0.000
Randomized trial0.000
Science and technology studies0.000
Open science0.000
Non-randomized trial0.000
Qualitative0.000
Meta-analysis0.000
Case report0.000

Gemma

Not applicable0.132
Theoretical or conceptual0.025
Simulation or modelling0.012
Observational0.002
Bibliometrics0.001
Metaresearch0.001
Research integrity0.001
Bench or experimental0.001
Science and technology studies0.000
Systematic review0.000
Scholarly communication0.000
Meta-epidemiology (broad)0.000
Meta-analysis0.000
Open science0.000
Meta-epidemiology (narrow)0.000
Non-randomized trial0.000
Case report0.000
Qualitative0.000
Randomized trial0.000

Machine scores (provisional)

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Opus teacher head0.050
GPT teacher head0.313
Teacher spread
0.263 how far apart the two teachers sit on this one work
Validation status
score_only:v0-immature-baseline verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Abstract

We provide limits to practical quantum key distribution, taking into account channel losses, a realistic detection process, and imperfections in the "qubits" sent from the sender to the receiver. As we show, even quantum key distribution with perfect qubits might not be achievable over long distances when the other imperfections are taken into account. Furthermore, existing experimental schemes (based on weak pulses) currently do not offer unconditional security for the reported distances and signal strength. Finally we show that parametric down-conversion offers enhanced performance compared to its weak coherent pulse counterpart.

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