Improving the maximum transmission distance of continuous-variable quantum key distribution with noisy coherent states using a noiseless amplifier

2014 ◽  
Vol 378 (38-39) ◽  
pp. 2808-2812 ◽  
Author(s):  
Tianyi Wang ◽  
Song Yu ◽  
Yi-Chen Zhang ◽  
Wanyi Gu ◽  
Hong Guo
Keyword(s):  
Quantum Key Distribution ◽  
Coherent States ◽  
Key Distribution ◽  
Continuous Variable ◽  
Transmission Distance ◽  
Maximum Transmission

scholarly journals Improving the maximum transmission distance of continuous-variable quantum key distribution using a noiseless amplifier

2014 ◽  
Author(s):  
Rémi Blandino ◽  
Anthony Leverrier ◽  
Marco Barbieri ◽  
Jean Etesse ◽  
Rosa Tualle-Brouri ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Continuous Variable ◽  
Transmission Distance ◽  
Maximum Transmission

DISCRETELY MODULATED CONTINUOUS-VARIABLE QUANTUM KEY DISTRIBUTION WITH A NONDETERMINISTIC NOISELESS AMPLIFIER

2013 ◽  
Vol 11 (04) ◽  
pp. 1350037 ◽  
Author(s):  
JIAN FANG ◽  
YUAN LU ◽  
PENG HUANG ◽  
GUANGQIANG HE ◽  
GUIHUA ZENG
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Continuous Variable ◽  
Excess Noise ◽  
Secret Key ◽  
Transmission Distance ◽  
Linear Amplifier ◽  
Detection Stage ◽  
Maximum Transmission ◽  
Better Than

In this paper, we first study a generalized protocol of discrete modulation for continuous-variable quantum key distribution with N coherent states in a Gaussian lossy and noisy channel and investigate its performance against collective attacks. We find that discrete modulation protocols with more than eight states do not perform better than the eight-state protocol. Then, we study the improvement of this protocol by using a nondeterministic noiseless linear amplifier (NLA) on Bob's detection stage. Results indicate that a NLA with gain g can extend the maximum transmission distance by 50 log 10g2 km and can increase the maximal tolerable excess noise. With the reconciliation efficiency β, we find the gain of NLA has a maximal value defined as g max and by adjusting the gain to about βg max one can have the best improvement on secret key rate.

Noise-enhanced CVQKD with untrusted source

2017 ◽  
Vol 31 (16) ◽  
pp. 1750143 ◽  
Author(s):  
Xiaoqun Wang ◽  
Chunhui Huang
Keyword(s):  
Quantum Key Distribution ◽  
Additive Noise ◽  
Key Distribution ◽  
Continuous Variable ◽  
Excess Noise ◽  
Transmission Distance ◽  
Simulation Results ◽  
The Impact ◽  
Maximum Transmission

The performance of one-way and two-way continuous variable quantum key distribution (CVQKD) protocols can be increased by adding some noise on the reconciliation side. In this paper, we propose to add noise at the reconciliation end to improve the performance of CVQKD with untrusted source. We derive the key rate of this case and analyze the impact of the additive noise. The simulation results show that the optimal additive noise can improve the performance of the system in terms of maximum transmission distance and tolerable excess noise.

scholarly journals Improving the maximum transmission distance of continuous-variable quantum key distribution using a noiseless amplifier

2012 ◽  
Vol 86 (1) ◽  
Author(s):  
Rémi Blandino ◽  
Anthony Leverrier ◽  
Marco Barbieri ◽  
Jean Etesse ◽  
Philippe Grangier ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Continuous Variable ◽  
Transmission Distance ◽  
Maximum Transmission

scholarly journals Performance Improvement of Discretely Modulated Continuous-Variable Quantum Key Distribution with Untrusted Source via Heralded Hybrid Linear Amplifier

Entropy ◽  
2020 ◽  
Vol 22 (8) ◽  
pp. 882
Author(s):  
Kunlin Zhou ◽  
Xuelin Wu ◽  
Yun Mao ◽  
Zhiya Chen ◽  
Qin Liao ◽  
...  
Keyword(s):  
Communication Networks ◽  
Quantum Key Distribution ◽  
Signal To Noise Ratio ◽  
Key Distribution ◽  
High Gain ◽  
Continuous Variable ◽  
Secret Key ◽  
Transmission Distance ◽  
Linear Amplifier ◽  
Maximum Transmission

In practical quantum communication networks, the scheme of continuous-variable quantum key distribution (CVQKD) faces a challenge that the entangled source is controlled by a malicious eavesdropper, and although it still can generate a positive key rate and security, its performance needs to be improved, especially in secret key rate and maximum transmission distance. In this paper, we proposed a method based on the four-state discrete modulation and a heralded hybrid linear amplifier to enhance the performance of CVQKD where the entangled source originates from malicious eavesdropper. The four-state CVQKD encodes information by nonorthogonal coherent states in phase space. It has better transmission distance than Gaussian modulation counterpart, especially at low signal-to-noise ratio (SNR). Moreover, the hybrid linear amplifier concatenates a deterministic linear amplifier (DLA) and a noiseless linear amplifier (NLA), which can improve the probability of amplification success and reduce the noise penalty caused by the measurement. Furthermore, the hybrid linear amplifier can raise the SNR of CVQKD and tune between two types of performance for high-gain mode and high noise-reduction mode, therefore it can extend the maximal transmission distance while the entangled source is untrusted.

Decoy state quantum-key-distribution by using odd coherent states without monitoring signal disturbance

2019 ◽  
Vol 17 (02) ◽  
pp. 1950012 ◽  
Author(s):  
Shujing Li ◽  
Hui Liu ◽  
Linguo Li
Keyword(s):  
Phase Shift ◽  
Quantum Key Distribution ◽  
Coherent States ◽  
Key Distribution ◽  
Differential Phase Shift ◽  
Decoy State ◽  
Transmission Distance ◽  
State Method ◽  
Decoy State Method ◽  
Maximum Transmission

Recently, a novel quantum-key-distribution (QKD) protocol, called Round-robin-differential-phase-shift (RRDPS) QKD, has been proposed to share a secure key without monitoring the signal disturbance. In this paper, we propose a decoy state RRDPS-QKD protocol with odd coherent states (OCS). We implement a one-intensity decoy state method into the RRDPS-QKD with OCS to estimate the key rate. The results show that both the maximum transmission distance and the key rate of our protocol are significantly improved. Moreover, only one-intensity decoy state is sufficient for the protocol to approach the asymptotic limit with infinite decoy states.

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