Workbench tool

QKD engineering lab

A complete first-pass workflow combining link budget, QBER estimate, post-processing accounting, and a selected simulation-only risk module.

PresetLengthkmFiber attenuationdB/kmMean photon numberDetector efficiencyMisalignment errorDetector dead timensAfterpulse probabilitySender Z-biasReceiver Z-biasRisk module

Raw detections/s

15,726,998

QBER

1.51%

Secret key rate

3,684,234bits/s

Dead-time availability

100%

Reconciliation leakage

927,007bits

Final key block

5,349,591bits

Risk module

low

Warnings and cautions

info: Decoy-state BB84 uses a single-photon lower-bound teaching proxy rather than full decoy estimation or finite-key proof terms.
info: Attack explorer outputs are educational risk proxies and do not describe how to attack deployed systems.

Formulas and assumptions

Asymptotic prepare-and-measure approximation with independent dark/background counts.
Detector dead time uses a non-paralyzable availability proxy, afterpulsing is modeled as a click-correlated noise term, and basis bias rescales the effective sifted fraction relative to the unbiased BB84 baseline.
Finite-key proof terms, rigorous decoy optimization, timing jitter, and side channels are still outside this teaching slice.
Secret fraction uses max(0, 1 - f_ec h2(Q) - h2(Q)); decoy-state mode replaces that asymptotic fraction with a single-photon lower-bound teaching proxy.
Sifting is a fixed multiplicative factor.
Reconciliation leakage is f_ec * remaining bits * h2(Q).
Privacy amplification uses the same h2(Q) proxy for phase-error cost.
Each module uses a simplified scalar risk proxy.
Countermeasures are conceptual and require hardware-specific security analysis.
No production attack instructions or deployed-system procedures are provided.

Tools

Engineering and research workbench

Loading the selected calculator, defaults, and scientific caution notes.

Preparing tool

Loading workbench view

Preparing calibrated controls, default presets, and explanatory notes.