scholarly journals Testing the photon-number statistics of a quantum key distribution light source

2018 ◽  
Vol 26 (18) ◽  
pp. 22733 ◽  
Author(s):  
J. F. Dynes ◽  
M. Lucamarini ◽  
K. A. Patel ◽  
A. W. Sharpe ◽  
M. B. Ward ◽  
...  
Keyword(s):  
Light Source ◽  
Quantum Key Distribution ◽  
Photon Number ◽  
Key Distribution

scholarly journals Sending-or-Not-Sending Twin-Field Quantum Key Distribution with Light Source Monitoring

Entropy ◽  
2019 ◽  
Vol 22 (1) ◽  
pp. 36
Author(s):  
Yucheng Qiao ◽  
Ziyang Chen ◽  
Yichen Zhang ◽  
Bingjie Xu ◽  
Hong Guo
Keyword(s):  
Light Source ◽  
Quantum Key Distribution ◽  
Source Monitoring ◽  
Selection Process ◽  
Photon Number ◽  
Security Analysis ◽  
Real Life ◽  
Key Distribution ◽  
Transmission Distance ◽  
Security Problem

Twin-field quantum key distribution (TF-QKD) is proposed to achieve a remote key distribution with a maximum secure transmission distance up to over 500 km. Although the security of TF-QKD in its detection part is guaranteed, there are some remaining problems in the source part. The sending-or-not-sending (SNS) protocol is proposed to solve the security problem in the phase post-selection process; however, the light source is still assumed to be an ideal coherent state. This assumption is not satisfied in real-life QKD systems, leading to practical secure issues. In this paper, we discuss the condition that the photon number distribution (PND) of the source is unknown for the SNS protocol, demonstrate that the security analysis is still valid under a source with unknown PND, and show that with light source monitoring, the performance of the SNS protocol can remain almost unchanged.

Phase-matching quantum key distribution with light source monitoring

2021 ◽  
Author(s):  
Wen-Ting Li ◽  
Le Wang ◽  
Wei Li ◽  
Sheng-Mei Zhao
Keyword(s):  
Light Source ◽  
Quantum Key Distribution ◽  
Source Monitoring ◽  
Transmission Loss ◽  
Key Distribution ◽  
Phase Matching ◽  
Measurement Device ◽  
Source Condition ◽  
Source Fluctuation ◽  
The Ideal

Abstract The transmission loss of photons during quantum key distribution(QKD) process leads to the linear key rate bound for practical QKD systems without quantum repeaters. Phase matching quantum key distribution (PM-QKD) protocol, an novel QKD protocol, can overcome the constraint with a measurement-device-independent structure, while it still requires the light source to be ideal. This assumption is not guaranteed in practice, leading to practical secure issues. In this paper, we propose a modified PM-QKD protocol with a light source monitoring, named PM-QKD-LSM protocol, which can guarantee the security of the system under the non-ideal source condition. The results show that our proposed protocol performs almost the same as the ideal PM-QKD protocol even considering the imperfect factors in practical systems. PM-QKD-LSM protocol has a better performance with source fluctuation, and it is robust in symmetric or asymmetric cases.

The enhanced measurement-device-independent quantum key distribution with heralded pair coherent state

2019 ◽  
Vol 34 (04) ◽  
pp. 2050063
Author(s):  
Yefeng He ◽  
Wenping Ma
Keyword(s):  
Light Source ◽  
Error Rate ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Generation Rate ◽  
Key Generation ◽  
Measurement Device ◽  
Decoy State ◽  
Communication Distance ◽  
Measurement Device Independent

With heralded pair coherent states (HPCS), orbital angular momentum (OAM) states and pulse position modulation (PPM) technology, a decoy-state measurement-device-independent quantum key distribution (MDI-QKD) protocol is proposed. OAM states and PPM technology are used to realize the coding of the signal states in the HPCS light source. The use of HPCS light source, OAM coding and PPM coding cannot only reduce the error rate but also improve the key generation rate and communication distance. The new MDI-QKD protocol also employs three-intensity decoy states to avoid the attacks against the light source. By calculating the error rate and key generation rate, the performance of the MDI-QKD protocol is analyzed. Numerical simulation shows that the protocol has very low error rate and very high key generation rate. Moreover, the maximum communication distance can reach 455 km.

scholarly journals Attacks exploiting deviation of mean photon number in quantum key distribution and coin tossing

2015 ◽  
Vol 91 (3) ◽  
Author(s):  
Shihan Sajeed ◽  
Igor Radchenko ◽  
Sarah Kaiser ◽  
Jean-Philippe Bourgoin ◽  
Anna Pappa ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Photon Number ◽  
Key Distribution ◽  
Coin Tossing
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