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Lecture notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

Using Redundancy-Free Quantum Channels for Improving the Satellite Communication

László Bacsárdi, László Gyöngyösi, Sándor Imre

Published Jan 1, 2010• 1 citation
Publisher
DOI
10.1007/978-3-642-13618-4_24

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In the next years we have to handle the problems originated from the decreasing size of microchips. As everyday life is getting faster it requires researchers and engineers to respond to the growing needs. In telecommunication applications one of the most crucial issue to solve is how to transmit as many bytes at a given frequency in a second as possible. One way to determine the system’s efficiency is to measure the number of bytes sent per second. In this chapter we presented the base of quantum mechanic based communication. We showed that there exist already algorithms to solve problems which are very difficult to be solved by traditional computers. The quantum theory has appeared in satellite communications offering answers for some of nowadays’ technical questions. We introduced two solutions which can be useful in redundancy-free communications. One of the primary requirements of long-distance and free-space quantum communication is the capability of the effective transmission of quantum states in non-ideal, noisy environments. The free-space and satellite quantum channel could be the way to increase significantly the distance limit of current quantum communication systems. The current earthbound freespace quantum channels have the advantage in that they can be combined with satellite quantum communication. In the future, we will be able to overcome the current distance limits in quantum communication by transmitting EPR-states from space to Earth.
Quantum key distribution is an effective encryption technique which can be used to perform secure quantum communication between satellite and ground stations. Quantum cryptography enhances security in various networks such as optical fibers and wireless networks. In addition to this, these networks become vulnerable in presence of high attenuation due to atmospheric effects and noise. Hence, errors occur due to decoherence. The noisy quantum channel is modeled and implemented by the redundancy-free quantum error correction scheme which provides better security and throughput efficiency as shown in simulation results.
Quantum key distribution is an effective encryption technique which can be used to perform secure quantum communication between satellite and ground stations. Quantum cryptography enhances security in various networks such as optical fibers and wireless networks. In addition to this, these networks become vulnerable in presence of high attenuation due to atmospheric effects and noise. Hence, errors occurs due to decoherence. The noisy quantum channel is modeled and implemented by the redundancy-free quantum error correction scheme which provides better security and throughput efficiency as shown in simulation results.