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Jisuanji fangzhen

Analysis and Simulation of Quantum Bit Rate in Satellite Based Quantum Key System

Liping Zhao

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

Quantum bit rate is an important parameter in quantum key distribution system.Quantum link during time in a satellite-to-ground quantum key distribution system was studied,and the variation of pitch angle at facility was analyzed.Then the link model between low earth orbit and earth station was built.By numerical analyzing,it is shown that,quantum bit rate varies with the satellite's movement and in the centre of link,the quantum bit rate reaches the maximal value.The results show that quantum bit rate in an earth-based station and low earth orbit satellite QKD system can reach the practical demand and is feasible.

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Jisuanji fangzhen•Jan 1, 2012•0 citations
Quantum bit rate is an important parameter in quantum key distribution system.Quantum link during time in a satellite-to-ground quantum key distribution system was studied,and the variation of pitch angle at facility was analyzed.Then the link model between low earth orbit and earth station was built.By numerical analyzing,it is shown that,quantum bit rate varies with the satellite's movement and in the centre of link,the quantum bit rate reaches the maximal value.The results show that quantum bit rate in an earth-based station and low earth orbit satellite QKD system can reach the practical demand and is feasible.
The quantum bit rate is an important operating parameter in free-space quantum key distribution. We introduce the measuring factor and the sifting factor, and present the expressions of the quantum bit rate based on the ideal single-photon sources and the single-photon sources with Poisson distribution. The quantum bit rate is studied in the numerical simulation for the laser links between a ground station and a satellite in a low earth orbit. The results show that it is feasible to implement quantum key distribution between a ground station and a satellite in a low earth orbit.
The expressions of the quantum key bit rate are given for free-space quantum key distribution by introducing the quantum channel transmission, the single-photon acquisition probability, the detection factor and the sifting factor. The quantum key bit rate is studied in the numerical simulation for the laser links between a ground station and a satellite in a low earth orbit. The results show that it is feasible to implement quantum key distribution between a ground station and a satellite in a low earth orbit.
Quantum bit error rate is an important operating parameter in quantum key distribution.As to the satellite-to-ground quantum key distribution,the highly attenuated laser pulses with Poisson distribution are used as single-photon sources.The theoretical model of the quantum bit error rate caused by the background light is established and the expressions of the quantum bit error rate are given.The quantum bit error rate is analyzed in the numerical simulation for the laser links between a ground station and a 300km altitude satellite in a low earth orbit.The study shows that the background light is one of the main factors that limit the link distance for free-space quantum key distribution,and that it is feasible to implement quantum key distribution between a ground station and a satellite in a low earth orbit.In daylight,the quantum bit error rate is on the order of 10-3～10-2,at night,10-4 during a full moon and 10-6～10-5 during a new moon.
This study aims at extending the concept of QKD to the optical free-space quantum communications domain. Moreover, the feasibility of a global satellite based quantum key distribution, in the low earth orbit (LEO) is investigated. Inline with this, three different link scenarios, including ground-to-ground, ground-to-satellite and satellite-to-satellite are considered. Moreover, system performance is analysed to show the sensitivity of the link to effect such as atmospheric attenuation, turbulence and detector noise. Generally, these factors are assumed to impair system performance by causing an overall increase in the systems quantum bit error rate (QBER), let alone limiting the communication bit rate and transmission distance of the link. The obtained results reveal the feasibility of satellite-based quantum key distribution in the LEO platform, a concept which could be potentially extended to geostationary earth orbit (GEO).
Link duration is one of the most important parameters which influence the quantum bit rate of the satellite-ground quantum key distribution.The factors that may influence the link duration are analyzed,and the simulation shows that with the increasing of the orbital altitude and the decreasing of the minimum elevation angle,the link duration is improved greatly;meanwhile,the distance between ground track of satellite and ground station is very important to the link duration of single photons link,so is the distance between two ground stations to entangled photons link;in the end,the link duration of entangled photons link is more complex than single photons link for its influencing factors,it is eventually determined by the relation of the ground track of satellite and the location of two ground stations.
Quantum bit error rate is an important operating parameter in quantum key distribution system.Aiming at satellite to earth quantum key distribution system,an quantum bit error rate model was established with several factors,such as background light,quantum polarization degradation,polarization misalignments and photodetector dark current.Calculation formula of quantum bit error rate and sifted key bits was given,as well as the numerical simulation results for laser links between ground and a 300km altitude satellite.This study shows that,when the pulse frequency is set at 30kHz and with good weather conditions,the quantum polarization degradation is the main factor that contributes to error bit,which provides the significant instruction for the design of satellite-earth quantum key distribution system.