Figure 2
From: Improved polar-code-based efficient post-processing algorithm for quantum key distribution

Channel polarization. \(R_N\) is the bit-reversal operation. When \(N=1\), \(W_1\) is the original channel W.
From: Improved polar-code-based efficient post-processing algorithm for quantum key distribution

Channel polarization. \(R_N\) is the bit-reversal operation. When \(N=1\), \(W_1\) is the original channel W.