scholarly journals Improving Eight-State Continuous Variable Quantum Key Distribution by Applying Photon Subtraction

2019 ◽  
Vol 9 (7) ◽  
pp. 1333 ◽  
Author(s):  
Qingquan Peng ◽  
Xiaodong Wu ◽  
Ying Guo
Keyword(s):  
Quantum Key Distribution ◽  
Single Photon ◽  
Key Distribution ◽  
Continuous Variable ◽  
Quantum States ◽  
Continuous Variables ◽  
Subtraction Method ◽  
Photon Subtraction ◽  
Channel Loss ◽  
Simulation Results

We propose a new method to effectively improve the performance of a quantum key distribution with eight-state continuous variables by the photon subtraction method. This operation is effective in increasing and distilling Gaussian entanglement between quantum states, and can be easily realized by existing technology. Simulation results show that the channel-loss tolerance of the eight-state continuous variable quantum key distribution (CVQKD) protocol can be extended by the appropriate photon subtraction algorithm; namely, single-photon subtraction.

scholarly journals Performance Improvement of Underwater Continuous-Variable Quantum Key Distribution via Photon Subtraction

Entropy ◽  
2019 ◽  
Vol 21 (10) ◽  
pp. 1011 ◽  
Author(s):  
Qingquan Peng ◽  
Guojun Chen ◽  
Xuan Li ◽  
Qin Liao ◽  
Ying Guo
Keyword(s):  
Performance Improvement ◽  
Quantum Key Distribution ◽  
Secure Communication ◽  
Key Distribution ◽  
Continuous Variable ◽  
Transmission Performance ◽  
Transmission Distance ◽  
Optical Attenuation ◽  
Photon Subtraction ◽  
Simulation Results

Considering the ocean water’s optical attenuation is significantly larger than that of Fiber Channel, we propose an approach to enhance the security of underwater continuous-variable quantum key distribution (CVQKD). In particular, the photon subtraction operation is performed at the emitter to enhance quantum entanglement, thereby improving the underwater transmission performance of the CVQKD. Simulation results show that the photon subtraction operation can effectively improve the performance of CVQKD in terms of underwater transmission distance. We also compare the performance of the proposed protocol in different water qualities, which shows the advantage of our protocol against water deterioration. Therefore, we provide a suitable scheme for establishing secure communication between submarine and submarine vehicles.

scholarly journals Quantum key distribution over a 40-dB channel loss using superconducting single-photon detectors

2007 ◽  
Vol 1 (6) ◽  
pp. 343-348 ◽  
Author(s):  
Hiroki Takesue ◽  
Sae Woo Nam ◽  
Qiang Zhang ◽  
Robert H. Hadfield ◽  
Toshimori Honjo ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Single Photon ◽  
Key Distribution ◽  
Photon Detectors ◽  
Single Photon Detectors ◽  
Channel Loss

scholarly journals Improving Underwater Continuous-Variable Measurement-Device-Independent Quantum Key Distribution via Zero-Photon Catalysis

Entropy ◽  
2020 ◽  
Vol 22 (5) ◽  
pp. 571
Author(s):  
Yuang Wang ◽  
Shanhua Zou ◽  
Yun Mao ◽  
Ying Guo
Keyword(s):  
Quantum Key Distribution ◽  
Single Photon ◽  
Elevation Angle ◽  
Key Distribution ◽  
Continuous Variable ◽  
Secret Key ◽  
Underwater Communications ◽  
Measurement Device ◽  
Transmission Distance ◽  
Measurement Device Independent

Underwater quantumkey distribution (QKD) is tough but important formodern underwater communications in an insecure environment. It can guarantee secure underwater communication between submarines and enhance safety for critical network nodes. To enhance the performance of continuous-variable quantumkey distribution (CVQKD) underwater in terms ofmaximal transmission distance and secret key rate as well, we adopt measurement-device-independent (MDI) quantum key distribution with the zero-photon catalysis (ZPC) performed at the emitter of one side, which is the ZPC-based MDI-CVQKD. Numerical simulation shows that the ZPC-involved scheme, which is a Gaussian operation in essence, works better than the single photon subtraction (SPS)-involved scheme in the extreme asymmetric case. We find that the transmission of the ZPC-involved scheme is longer than that of the SPS-involved scheme. In addition, we consider the effects of temperature, salinity and solar elevation angle on the system performance in pure seawater. The maximal transmission distance decreases with the increase of temperature and the decrease of sunlight elevation angle, while it changes little over a broad range of salinity

scholarly journals Non-Gaussian postselection and virtual photon subtraction in continuous-variable quantum key distribution

2016 ◽  
Vol 93 (1) ◽  
Author(s):  
Zhengyu Li ◽  
Yichen Zhang ◽  
Xiangyu Wang ◽  
Bingjie Xu ◽  
Xiang Peng ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Virtual Photon ◽  
Key Distribution ◽  
Continuous Variable ◽  
Photon Subtraction ◽  
Non Gaussian

Implementation of continuous variable quantum cryptography in optical fibres using a go-&-return configuration

2006 ◽  
Vol 6 (4&5) ◽  
pp. 326-335
Author(s):  
M. Legré ◽  
H. Zbinden ◽  
N. Gisin
Keyword(s):  
Quantum Cryptography ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Continuous Variable ◽  
Optical Fibres ◽  
Continuous Variables ◽  
Phase Fluctuations ◽  
Degree Of Stability ◽  
Set Up ◽  
High Degree

We demonstrate an implementation of quantum key distribution with continuous variables based on a go-&-return configuration over distances up to 14km. This configuration leads to self-compensation of polarisation and phase fluctuations. We observe a high degree of stability of our set-up over many hours.

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