scholarly journals Overcoming the rate–distance limit of device-independent quantum key distribution

2021 ◽  
Author(s):  
Yuan-Mei Xie ◽  
Bing-Hong Li ◽  
Yu-Shuo Lu ◽  
Xiao-Yu Cao ◽  
Wen-Bo Liu ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Distance Limit

scholarly journals Realistic rate–distance limit of continuous-variable quantum key distribution

2019 ◽  
Vol 27 (9) ◽  
pp. 13372 ◽  
Author(s):  
Xuyang Wang ◽  
Siyou Guo ◽  
Pu Wang ◽  
Wenyuan Liu ◽  
Yongmin Li
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Continuous Variable ◽  
Distance Limit

scholarly journals Practical Analysis of Sending or Not-Sending Twin-Field Quantum Key Distribution with Frequency Side Channels

2021 ◽  
Vol 11 (20) ◽  
pp. 9560
Author(s):  
Yi-Fei Lu ◽  
Mu-Sheng Jiang ◽  
Yang Wang ◽  
Xiao-Xu Zhang ◽  
Fan Liu ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Practical Implementation ◽  
Side Channel ◽  
Secret Key ◽  
Side Channel Attack ◽  
Long Distance ◽  
Side Channels ◽  
The Subject ◽  
Distance Limit

The twin-field quantum key distribution (TF-QKD) and its variants can overcome the fundamental rate-distance limit of QKD. However, their physical implementations with the side channels remain the subject of further research. We test the side channel of a type of external intensity modulation that applies a Mach–Zehnder-type electro-optical intensity modulator, which shows the distinguishability of the signal and decoy states in the frequency domain. Based on this security loophole, we propose a side-channel attack, named the passive frequency-shift attack, on the imperfect implementation of the sending or not-sending (SNS) TF-QKD protocol. We analyze the performance of the SNS protocol with the actively odd-parity pairing (AOPP) method under the side-channel attack by giving the formula of the upper bound of the real secret key rate and comparing it with the lower bound of the secret key rate under Alice and Bob’s estimation. The simulation results quantitatively show the effectiveness of the attack on the imperfect devices at a long distance. Our results emphasize the importance of practical security at the light source and might provide a valuable reference for device selection in the practical implementation of the SNS protocol.

scholarly journals Overcoming the rate–distance limit of quantum key distribution without quantum repeaters

Nature ◽  
2018 ◽  
Vol 557 (7705) ◽  
pp. 400-403 ◽  
Author(s):  
M. Lucamarini ◽  
Z. L. Yuan ◽  
J. F. Dynes ◽  
A. J. Shields
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Quantum Repeaters ◽  
Distance Limit

scholarly journals Beating the Fundamental Rate-Distance Limit in a Proof-of-Principle Quantum Key Distribution System

2019 ◽  
Vol 9 (2) ◽  
Author(s):  
Shuang Wang ◽  
De-Yong He ◽  
Zhen-Qiang Yin ◽  
Feng-Yu Lu ◽  
Chao-Han Cui ◽  
...  
Keyword(s):  
Distribution System ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Distance Limit ◽  
Proof Of Principle

Quantum Key Distribution: Attacks and Solutions

2020 ◽  
Author(s):  
Vimal Gaur ◽  
Devika Mehra ◽  
Anchit Aggarwal ◽  
Raveena Kumari ◽  
Srishti Rawat
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution
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