Synchronization of quantum communication systems based on correlated photons

Author(s):  
Christopher Spiess ◽  
Sebastian Töpfer ◽  
Sakshi Sharma ◽  
Andrej Krzic ◽  
Gregor Sauer ◽  
...  
2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shihan Sajeed ◽  
Poompong Chaiwongkhot ◽  
Anqi Huang ◽  
Hao Qin ◽  
Vladimir Egorov ◽  
...  

AbstractAlthough quantum communication systems are being deployed on a global scale, their realistic security certification is not yet available. Here we present a security evaluation and improvement protocol for complete quantum communication systems. The protocol subdivides a system by defining seven system implementation sub-layers based on a hierarchical order of information flow; then it categorises the known system implementation imperfections by hardness of protection and practical risk. Next, an initial analysis report lists all potential loopholes in its quantum-optical part. It is followed by interactions with the system manufacturer, testing and patching most loopholes, and re-assessing their status. Our protocol has been applied on multiple commercial quantum key distribution systems to improve their security. A detailed description of our methodology is presented with the example of a subcarrier-wave system. Our protocol is a step towards future security evaluation and security certification standards.


PRX Quantum ◽  
2021 ◽  
Vol 2 (3) ◽  
Author(s):  
Gong Zhang ◽  
Ignatius William Primaatmaja ◽  
Jing Yan Haw ◽  
Xiao Gong ◽  
Chao Wang ◽  
...  

2009 ◽  
Vol 11 (4) ◽  
pp. 045016 ◽  
Author(s):  
Alan Mink ◽  
Joshua C Bienfang ◽  
Robert Carpenter ◽  
Lijun Ma ◽  
Barry Hershman ◽  
...  

2013 ◽  
Vol 11 (02) ◽  
pp. 1350022
Author(s):  
ELLOÁ B. GUEDES ◽  
FRANCISCO M. DE ASSIS

Decoherence is one of the main obstacles in quantum information processing. In cryptographic scenarios, in particular, decoherence is not only responsible for the loss of the quantum properties but also for information leakage out to a wiretapper. Given that decoherence must be fought in real-world quantum communication systems, we present a scheme, using decoherence-free subspaces and subsystems, to perform secure classical communications through noisy quantum channels. Using quantum information and wiretap theories, we establish a proof of unconditional security of our scheme. We illustrate our proposal with a non-trivial example and discuss some of its impacts on already existing quantum secure message exchange protocols. Furthermore, we present some up-to-date technologies that can be used for practical implementation of the scheme proposed.


2014 ◽  
Vol 53 (8) ◽  
pp. 086103 ◽  
Author(s):  
Travis S. Humble ◽  
Ronald J. Sadlier

2015 ◽  
Vol 103 ◽  
pp. 04010
Author(s):  
A.V. Shkalikov ◽  
I.Z. Latypov ◽  
D.O. Akatyev ◽  
A.A. Kalachev

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