Reverse Reconciliation of Quantum Gaussian Distributed Key
| Autor: | 蔡虹 Cai Hong, 张宁 Zhang Ning, 郭大波 Guo Da-bo, 刘纲 Liu Gang |
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| Rok vydání: | 2013 |
| Předmět: |
Theoretical computer science
Computer science Gaussian Binary number Data_CODINGANDINFORMATIONTHEORY General Medicine Quantum key distribution symbols.namesake symbols Low-density parity-check code Tanner graph Error detection and correction Algorithm Decoding methods Computer Science::Cryptography and Security Computer Science::Information Theory Coding (social sciences) |
| Zdroj: | Acta Sinica Quantum Optica. 19:219-226 |
| ISSN: | 1007-6654 |
| Popis: | The party Alice in a cryptograph system transmits coherent quantum signals to the party Bob,obtaining a series of correlated continuous Gaussian variables.The process to distill a binary key out of the correlated Gaussian variables that they share is called continuous-variable quantum key distribution(CVQKD).Reconciliation in CVQKD,i.e.,to correct differences between the correlated variables,is the key issue discussed in the paper.Based on both sliced error correction(SEC) protocol and multilevel coding/multistage decoding(MLC/MSD),reconciliation is implemented by LDPC code-based Slepian-Wolf CODEC.According to the proposed multilevel Tanner graph which depicts message transition of information,multistage iterative intrinsic and extrinsic information belief-propagation(LLR-BP) update formulae are derived.Three decoding modes of MSD are compared experimentally in convergence and performance.Simulation results show that the proposed algorithm can reconcile reliably 10000 continuous quantum variables with efficiency of 92.3% when SNR of the channel is above 2.5 dB. |
| Databáze: | OpenAIRE |
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