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

Optical Power Limiters for Securing Practical Quantum Communication Systems

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

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 EDFA AND EYCDFA POWER BOOSTER FOR SECURED, HIGH SPEED AND MULTIPLE WAVELENGTH SERVICES IN OPTICAL COMMUNICATION SYSTEMS USING WDM AND QUAD-SINGLE FORWARD AND TRI BACKWARD PUMPING TECHNIQUE

2021 ◽  
Vol 5 (12) ◽  
Author(s):  
S. Semmalar ◽  
S. Malarkkan
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Communication ◽  
Communication Systems ◽  
High Speed ◽  
Optical Power ◽  
Fiber Amplifier ◽  
Signal Power ◽  
Erbium Doped Fiber Amplifier ◽  
Output Optical Power ◽  
Wavelength Division

Proposed the EDFA and EYCDFA power booster (Erbium Doped Fiber Amplifier- Erbium ytterbium co doped fiber amplifier) with quad pumping for high speed and multi wavelength services in an optical communication. The proposed EDFA and EYCDFA power booster with WDM(Wavelength division multiplexing) simulated by dual forward and Backward pumping, Dual-backward pumping, Tri-single forward and dual backward pumping and Quadsingle forward and tri-backward pumping with respect to Pump power and fiber Length. The parameters Input Optical power, Output Optical power, Forward Signal power, Backward Signal power measured and determined the speed of transmission in all types of pumping methods. From that the proposed EDFA- ans EYCDFA power booster with WDM quad pumping is the best suitable for secured high speed optical telecommunication systems. The results shown in Quad pumping Output optical power is maximum 25.2dB and optimum spectral forward Signal power is 30.5dBm and very less spectral optical backward signal power of -25.4dBm with Length 5m

Maximum Optical Power Efficiency in SDM-Based Optical Communication Systems

2017 ◽  
Vol 29 (13) ◽  
pp. 1075-1077 ◽  
Author(s):  
Oleg V. Sinkin ◽  
Alexey V. Turukhin ◽  
William W. Patterson ◽  
Maxim A. Bolshtyansky ◽  
Dmitri G. Foursa ◽  
...  
Keyword(s):  
Optical Communication ◽  
Communication Systems ◽  
Power Efficiency ◽  
Optical Power ◽  
Optical Communication Systems

Satellite-to-Ground FSO System Based on Multiaperture Receivers as an Optimization Solution for Strong Turbulence and Fog Conditions

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hilal A. Fadhil
Keyword(s):  
Communication Systems ◽  
Optical Power ◽  
Spatial Diversity ◽  
Climatic Conditions ◽  
Free Space Optics ◽  
Focal Points ◽  
Maximum Throughput ◽  
Space Optics ◽  
Coherent Receivers ◽  
Key Driver

AbstractSatellite-to-Ground Downlink-Free Space Optics (SatGD-FSO) communication systems are emerging as the key driver for telecom investment, with several factors driving this convergence. It is attractive to minimize the size, weight, and power profiles of the space terminals by utilizing high affectability and huge accumulation collection zone ground terminals. Multiaperture coherent receivers using spatial diversity approached is considered on the attractive solution can fulfill this necessity and have numerous focal points over the single enormous opening cognizant recipients. The effects of atmospheric and climatic conditions using various dynamic system parameters have been investigated as a function of bit-error-rate (BER) performance of multiaperture coherent receivers. Types of orbits, aperture averaging, zenith angle, transmit optical power, and modulation schemes are systematically investigated and compared to the SatGD communication system. The proposed solution with a maximum throughput of 2.5 Gbps is useful for a plan and optimization improvement of the SatGD-FSO systems.

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

ON THE SECURITY OF DECOHERENCE-FREE SUBSPACES AND SUBSYSTEMS FOR CLASSICAL INFORMATION CONVEYING THROUGH QUANTUM CHANNELS

2013 ◽  
Vol 11 (02) ◽  
pp. 1350022
Author(s):  
ELLOÁ B. GUEDES ◽  
FRANCISCO M. DE ASSIS
Keyword(s):  
Quantum Information ◽  
Communication Systems ◽  
Quantum Communication ◽  
Quantum Information Processing ◽  
Information Leakage ◽  
Practical Implementation ◽  
Quantum Channels ◽  
Quantum Properties ◽  
Message Exchange ◽  
Decoherence Free Subspaces

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.

scholarly journals Numerical Estimation of Spectral Properties of Laser Based on Rate Equations

2016 ◽  
Vol 2016 ◽  
pp. 1-11
Author(s):  
Jan Litvik ◽  
Michal Kuba ◽  
Daniel Benedikovic ◽  
Jozef Dubovan ◽  
Milan Dado
Keyword(s):  
Spectral Density ◽  
Power Spectral Density ◽  
Communication Systems ◽  
Spectral Properties ◽  
Optical Power ◽  
Time Dependent ◽  
Rate Equations ◽  
Laser Linewidth ◽  
Power Spectral ◽  
Laser Signal

Laser spectral properties are essential to evaluate the performance of optical communication systems. In general, the power spectral density of the phase noise has a crucial impact on spectral properties of the unmodulated laser signal. Here the white Gaussian noise and1/f-noise are taken into the consideration. By utilizing the time-dependent realizations of the instantaneous optical power and the phase simultaneously, it is possible to estimate the power spectral density or alternatively the power spectrum of an unmodulated laser signal shifted to the baseband and thus estimate the laser linewidth. In this work, we report on the theoretical approach to analyse unmodulated real-valued high-frequency stationary random passband signal of laser, followed by presenting the numerical model of the distributed feedback laser to emulate the time-dependent optical power and the instantaneous phase, as two important time domain laser attributes. The laser model is based on numerical solving the rate equations using fourth-order Runge-Kutta method. This way, we show the direct estimation of the power spectral density and the laser linewidth, when time-dependent laser characteristics are known.

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