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Secret Key Distillation for Continuous Variable Quantum Key Distribution against Gaussian Classical Eve

Yibo Zhao, Zheng‐Fu Han, Jin-jian Chen +2 more

The continuous variable quantum key distribution is expected to provide high secret key rate without single photon source and detector, while the lack of the effective key distillation method makes it unpractical under the high loss condition. Here we present a single-bit-reverse-reconciliation protocol against Gaussian classical Eve, which can distill the secret key through practical imperfect error correction with high efficiency. The simulation results show that this protocol can distill secret keys even when the transmission fibre is longer than 150 km, which may make the continuous variable scheme to outvie the single photon one.The continuous variable quantum key distribution is expected to provide high secret key rate without single photon source and detector, while the lack of the effective key distillation method makes it unpractical under the high loss condition. Here we present a single-bit-reverse-reconciliation protocol against Gaussian classical Eve, which can distill the secret key through practical imperfect error correction with high efficiency. The simulation results show that this protocol can distill secret keys even when the transmission fibre is longer than 150 km, which may make the continuous variable scheme to outvie the single photon one.

Chinese Physics LettersSep 1, 20080 citations

High-efficiency Gaussian key reconciliation in continuous variable quantum key distribution

Zengliang Bai, Xuyang Wang, Shenshen Yang +1 more

Science China Physics Mechanics and AstronomyDec 18, 201535 citations

Quantum key distribution using continuous-variable non-Gaussian states

L. F. M. Borelli, L. S. Aguiar, J. A. Roversi +1 more

arXiv:1409.1248Quantum Information ProcessingNov 30, 201520 citations

High Efficient Secret Key Distillation for Long Distance Continuous Variable Quantum Key Distribution

Yibo Zhao, Zheng‐Fu Han, Chen, Jin-jian +2 more

The continuous variable quantum key distribution is expected to provide high secret key rate without single photon source and detector, but the lack of the secure and effective key distillation method makes it unpractical. Here, we present a secure single-bit-reverse-reconciliation protocol combined with secret information concentration and post-selection, which can distill the secret key with high efficiency and low computational complexity. The simulation results show that this protocol can provide high secret key rate even when the transmission fiber is longer than 150km, which may make the continuous variable scheme to outvie the single photon one.The continuous variable quantum key distribution is expected to provide high secret key rate without single photon source and detector, but the lack of the secure and effective key distillation method makes it unpractical. Here, we present a secure single-bit-reverse-reconciliation protocol combined with secret information concentration and post-selection, which can distill the secret key with high efficiency and low computational complexity. The simulation results show that this protocol can provide high secret key rate even when the transmission fiber is longer than 150km, which may make the continuous variable scheme to outvie the single photon one.

arXiv:quant-ph/0603068Mar 8, 20060 citations

Practical, high-speed Gaussian coherent state continuous variable quantum key distribution with real-time parameter monitoring, optimised slicing, and post-processed key distillation

Amanda Weerasinghe, Muataz Alhussein, Adam Alderton +2 more

Gaussian coherent state continuous variable quantum key distribution has gained interest owing to its security and compatibility with classical coherent optical fibre networks. For successful system deployment it is necessary to implement practical high speed systems which distil keys efficiently. Here, we demonstrate a Gaussian coherent state continuous variable quantum key distribution system at a 50 MHz symbol rate. Unlike most demonstrations to date which measure excess noise and infer key rates from this, we record signals in real time and distil keys. We also demonstrate, for the first time, slice reconciliation with optimised guard bands to maximise achievable secret key rates. Using this optimisation with multilevel slicing, a record 5 Mb/s secret key rate after a transmission distance of 25 km is achieved. This is a significant improvement on the 3 Mb/s secret key rate which is achieved with single level optimised slice reconciliation.Gaussian coherent state continuous variable quantum key distribution has gained interest owing to its security and compatibility with classical coherent optical fibre networks. For successful system deployment it is necessary to implement practical high speed systems which distil keys efficiently. Here, we demonstrate a Gaussian coherent state continuous variable quantum key distribution system at a 50 MHz symbol rate. Unlike most demonstrations to date which measure excess noise and infer key rates from this, we record signals in real time and distil keys. We also demonstrate, for the first time, slice reconciliation with optimised guard bands to maximise achievable secret key rates. Using this optimisation with multilevel slicing, a record 5 Mb/s secret key rate after a transmission distance of 25 km is achieved. This is a significant improvement on the 3 Mb/s secret key rate which is achieved with single level optimised slice reconciliation.

Scientific ReportsDec 6, 20239 citations

Reverse reconciliation for continuous variable quantum key distribution

Lu Zhi-Xin, Li Yu, Kang Li +4 more

Science China Physics Mechanics and AstronomyJan 1, 201018 citations

Secret Key Distillation for Continuous Variable Quantum Key Distribution against Gaussian Classical Eve

Abstract

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Secret Key Distillation for Continuous Variable Quantum Key Distribution against Gaussian Classical Eve

Abstract

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