Workbench tool

Channel planner

Plan fiber, free-space, and satellite-style channels by adding dB losses and passing the result into the simplified QKD key-rate model.

Link typeLengthkmFiber attenuationdB/kmConnector lossdBGeometric lossdBPointing lossdBAtmospheric lossdBAverage satellite lossdBDuty cycle

Total loss

11dB

Detection probability

0.791%

Key-rate estimate

1,841,419bits/s

QBER

1.52%

Availability

100%

Transmittance

0.07943

Fiber model uses linear attenuation plus connector, splice, and component losses.

info: Decoy-state BB84 uses a single-photon lower-bound teaching proxy rather than full decoy estimation or finite-key proof terms.

Formulas and assumptions

Loss terms are added in dB and converted to a linear transmittance.
The secure-key-rate estimate reuses the simplified QKD link-budget model.
Weather, turbulence, fading, pointing dynamics, and finite-key security are outside the MVP model.

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