High-Speed Implementation of Length-Compatible Privacy Amplification in Continuous-Variable Quantum Key Distribution

High-Speed Implementation of Length-Compatible Privacy Amplification in Continuous-Variable Quantum Key Distribution

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Privacy amplification is an indispensable step in postprocessing of continuous-variable quantum key distribution (CV-QKD), which is used to distill unconditional secure keys from identical corrected keys between two distant legal parties.The processing speed of privacy amplification has a significant effect on the Holiday Decorations secret key rate of a CV-QKD system.We report the high-speed parallel implementation of the length-compatible privacy amplification algorithm based on a graphic processing unit.

The length-compatible algorithm Cases is used to satisfy the security requirements of privacy amplification at different transmission distances when considering finite-size effect.We achieve the speed of privacy amplification over 1 Gb/s at arbitrary input length and the speed is one to two orders of magnitude faster than previous demonstrations, which supports the high-speed real-time CV-QKD system and ensures the security of privacy amplification.