Continuous-Variable Quantum Key Distribution with Rateless Reconciliation Protocol
Chao Zhou, Xiangyu Wang, Yichen Zhang, Zhiguo Zhang, Song Yu, Hong Guo · Physical Review Applied · 2019
Can encrypted communication be secure at practical speeds? The authors propose a $r\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}l\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}s\phantom{\rule{0}{0ex}}s$ $r\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}c\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}c\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}l\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}n$ $p\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}c\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}l$ to overcome the technical difficulties for efficient error correction at different signal-to-noise ratios (SNRs), and therefore to significantly improve the performance of continuous-variable quantum key distribution (CV-QKD). Using this method, highly efficient key extraction can be maintained even at ultralow SNR. This method remarkably reduces the complexity of reconciliation, improves the robustness of practical systems, and can significantly improve the post-processing performance of CV-QKD, bringing secure quantum communication one step closer to everyday use.