Power sharing with LDPC-based CV-QKD reconciliation

Characterize the impact of power sharing between classical and quantum signal components in simultaneous quantum and classical communication systems employing LDPC-based continuous-variable quantum-key-distribution reconciliation schemes.

Background

SQCC superimposes classical and quantum signals, so allocating transmit power between the two components directly affects classical demodulation, quantum-channel quality, and reconciliation success. The paper studies representative power-sharing ratios using LDPC reconciliation, but it explicitly states that this interaction had not previously been investigated in the context of LDPC-based CV-QKD reconciliation, identifying it as an open problem that motivates the proposed analysis.