Rate-Adaptive Information Reconciliation for CV-QKD Systems at Low Signal-to-Noise Ratios

. 2025 Dec 20;28(1):10. doi: 10.3390/e28010010

Algorithm 1 The code rate calculation process of the SIR protocol.

Step 1 Obtain the channel capacity C(s) based on the practical SNR.

Step 2 Determine the target reconciliation efficiency

β

Step 3 Sort the bits in descending order of reliability

| L_{i} |

Step 4 Obtain the optimal code rate

R_{S I R}

using Equation (2).

Step 5 Determine the

l_{S I R}

to disclose

R_{0} \to R_{S I R}

using Equation (7).