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photon-counting

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sat-qkd-security-curves

Quantum keys can fail quietly. Loss and noise can leave you with bits, but no secrecy. We model the cliff to expose silent breakage before it becomes a system risk.

  • Updated Jul 26, 2026
  • Python

Exact quantum capacities under partial environmental observation and joint-register degradation. Includes optimal photon counting over all predetermined individual helper measurements in a qubit loss model, a strict collective-measurement rate advantage, and energy limits for vacuum optical splitting.

  • Updated Oct 9, 2026
  • Python

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