Numerical approach for unstructured quantum key distribution

Understand

Quantum key distribution (QKD) allows for communication with security guaranteed by quantum theory.

• The main theoretical problem in QKD is to calculate the secret key rate for a given protocol.
• Analytical formulas are known for protocols with symmetries, since symmetry simplifies the analysis.
• However, experimental imperfections break symmetries, hence the effect of imperfections on key rates is difficult to estimate.