scholarly journals An approach for security evaluation and certification of a complete quantum communication system

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shihan Sajeed ◽  
Poompong Chaiwongkhot ◽  
Anqi Huang ◽  
Hao Qin ◽  
Vladimir Egorov ◽  
...  
Keyword(s):  
Communication Systems ◽  
Distribution Systems ◽  
Quantum Communication ◽  
Global Scale ◽  
Security Evaluation ◽  
Wave System ◽  
System Implementation ◽  
Optical Part ◽  
Quantum Optical ◽  
Complete Quantum

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.

Synchronization of quantum communication systems based on correlated photons

2021 ◽  
Author(s):  
Christopher Spiess ◽  
Sebastian Töpfer ◽  
Sakshi Sharma ◽  
Andrej Krzic ◽  
Gregor Sauer ◽  
...  
Keyword(s):  
Communication Systems ◽  
Quantum Communication

scholarly journals A model to estimate performance of space-based quantum communication protocols including quantum key distribution systems

2017 ◽  
Vol 16 (1) ◽  
pp. 5-13
Author(s):  
Jonathan C Denton ◽  
Douglas D Hodson ◽  
Richard G Cobb ◽  
Logan O Mailloux ◽  
Michael R Grimaila ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Distribution Systems ◽  
Quantum Communication ◽  
Channel Model ◽  
Communication Protocols ◽  
Key Distribution ◽  
General Purpose ◽  
Optical Channel ◽  
Use Case ◽  
Atmospheric Conditions

This work presents a model to estimate the performance of space-based, optical-based, quantum communication protocols. This model consists of components to account for optical channel propagation effects based on orbit selection and atmospheric conditions. The model presented is general purpose and can be leveraged to evaluate the performance of a variety of quantum communication protocols, of which, Quantum Key Distribution (QKD) systems served as our motivating use case of particular interest. To verify correctness, the model is used to produce estimates for QKD system scenarios and compared to published results. The performance of QKD systems is of interest as distance limitations for terrestrial-based systems have hindered their practical use, and satellite-based designs that can generate a shared key between two distant geographic locations have been proposed. For this application domain, a review of space-based designs that illuminate the need for a free space downlink channel model is presented followed by its development to estimate the performance of quantum exchanges between a satellite and ground site.

scholarly journals Proposal for space-borne quantum memories for global quantum networking

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Mustafa Gündoğan ◽  
Jasminder S. Sidhu ◽  
Victoria Henderson ◽  
Luca Mazzarella ◽  
Janik Wolters ◽  
...  
Keyword(s):  
Quantum Communication ◽  
Global Scale ◽  
Space Systems ◽  
Quantum Communications ◽  
Communication Links ◽  
Probabilistic Detection ◽  
Entanglement Distribution ◽  
Near Term ◽  
Quantum Internet ◽  
Memory Characteristics

AbstractGlobal-scale quantum communication links will form the backbone of the quantum internet. However, exponential loss in optical fibres precludes any realistic application beyond few hundred kilometres. Quantum repeaters and space-based systems offer solutions to overcome this limitation. Here, we analyse the use of quantum memory (QM)-equipped satellites for quantum communication focussing on global range repeaters and memory-assisted (MA-) QKD, where QMs help increase the key rate by synchronising otherwise probabilistic detection events. We demonstrate that satellites equipped with QMs provide three orders of magnitude faster entanglement distribution rates than existing protocols based on fibre-based repeaters or space systems without QMs. We analyse how entanglement distribution performance depends on memory characteristics, determine benchmarks to assess the performance of different tasks and propose various architectures for light-matter interfaces. Our work provides a roadmap to realise unconditionally secure quantum communications over global distances with near-term technologies.

scholarly journals Securing Practical Quantum Communication Systems with Optical Power Limiters

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

Ocean Wave Measurements From ENVISAT ASAR Data Using a Parametric Inversion Scheme

2004 ◽  
Author(s):  
J. Schulz-Stellenfleth ◽  
S. Lehner ◽  
D. Hoja ◽  
J. C. Nieto-Borge
Keyword(s):  
A Priori ◽  
Wave Spectrum ◽  
Global Scale ◽  
Wave Mode ◽  
Ocean Wave ◽  
Wave System ◽  
Wave Spectra ◽  
Data Set ◽  
Envisat Asar ◽  
Sar Imaging

A parametric algorithm is presented to estimate two-dimensional ocean wave spectra from ENVISAT ASAR wave mode data on a global scale. The retrieval scheme makes use of prior information taken from numerical wave models. The Partition Rescale and Shift algorithm (PARSA) is based on a partitioning technique, which splits an a priori wave spectrum into its wave system components. Integral parameters of these systems, such as mean direction, mean wavelength, waveheight, and directional spreading are then adjusted iteratively to improve the consistency with the SAR observation. The method takes into account the full nonlinear SAR imaging process and uses a maximum a posteriori approach, which is based on statistical model quantifying the errors of the SAR imaging model, the SAR measurement, and the prior wave spectra. The method is applied to a global data set of ENVISAT ASAR data acquired during the CAL/VAL phase. The benefit of cross spectra compared to conventional symmetric image spectra is demonstrated.

scholarly journals Decentralized Smart Grid Voltage Control by Synchronization of Linear Multiagent Systems in the Presence of Time-Varying Latencies

Electronics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1470 ◽  
Author(s):  
Amedeo Andreotti ◽  
Bianca Caiazzo ◽  
Alberto Petrillo ◽  
Stefania Santini ◽  
Alfredo Vaccaro
Keyword(s):  
Power Distribution ◽  
Communication Systems ◽  
Cooperative Control ◽  
Distribution Systems ◽  
Robustness Analysis ◽  
Voltage Control ◽  
Test System ◽  
Time Varying ◽  
Power Network ◽  
Distributed Intelligence

Modern power distribution systems require reliable, self-organizing and highly scalable voltage control systems, which should be able to promptly compensate the voltage fluctuations induced by intermittent and non-programmable generators. However, their deployment in realistic operation scenarios is still an open issue due, for example, to the presence of non-ideal and unreliable communication systems that allow each component within the power network to share information about its state. Indeed, due to technological constraints, time-delays in data acquisition and transmission are unavoidable and their effects have to be taken into account in the control design phase. To this aim, in this paper, we propose a fully distributed cooperative control protocol allowing the voltage control to be achieved despite the presence of heterogeneous time-varying latencies. The idea is to exploit the distributed intelligence along the network, so that it is possible to bring out an optimal global behavior via cooperative distributed control action that leverages both local and the outdated information shared among the devices within the power network. Detailed simulation results obtained on the realistic case study of the IEEE 30-bus test system are presented and discussed in order to prove the effectiveness of the proposed approach in the task of solving complex voltage control problems. Finally, a robustness analysis with respect to both loads variations and hard communication delays was also carried to disclose the efficiency of the approach.

scholarly journals Programmable instrumentation and gigahertz signaling for single-photon quantum communication systems

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