Tools
Engineering and research workbench
Loading the selected calculator, defaults, and scientific caution notes.
Preparing tool
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Preparing calibrated controls, default presets, and explanatory notes.
Tools
Loading the selected calculator, defaults, and scientific caution notes.
Loading workbench view
Preparing calibrated controls, default presets, and explanatory notes.
Workbench tool
Estimate channel loss, detection probability, QBER, and a cautious asymptotic secret-key-rate proxy with a distance sweep.
Shareable URL state
Keep the current calculator inputs in the URL so this teaching setup can be reopened or shared without exporting files.
Only model inputs are stored in the link. No keys or telemetry are added.
Total loss
8dB
QBER
1.51%
Secret key rate
3,684,234bits/s
Raw click rate
15,726,998Hz
Signal detection
1.57%
Secret fraction
46.9%
Dead-time availability
100%
1.0 means the detector timing proxy is inactive.
Afterpulse noise
0%
Click-correlated noise term added before the dead-time availability scaling.
Effective sifted fraction
50%
Basis agreement 50% relative to the configured baseline.
This teaching panel exposes the single-photon lower-bound proxy that replaces the asymptotic BB84 secret fraction when decoy-state mode is selected.
Single-photon emission
26.8%
Multi-photon emission
6.16%
Single-photon gain lower bound
1.06%
Single-photon error upper bound
1.5%
Single-photon click share
67.6%
Lower-bound contribution relative to total click probability.
Decoy lower-bound rate
3,684,234bits/s
distanceKm spans 0.00 to 160 while secretKeyRateHz spans 2.38e+3 to 1.17e+7. Midpoint sample: distanceKm 80.0, secretKeyRateHz 2.86e+5.