In recent years, quantum communication is emerging as a new era of technology. As space offers a suitable environment for different quantum physical experiments with different velocities and distances which are not possible on ground. As satellites cover larger distance it is interesting to know about recent studies and experiments on quantum communication with satellites as quantum technology offers secure transmission. This paper demonstrates in detail description of quantum communication with satellites, its requirements and latest achievements in quantum communication with satellites.
In recent years, quantum communication is emerging as a new era of technology. As space offers a suitable environment for different quantum physical experiments with different velocities and distances which are not possible on ground. As satellites cover larger distance it is interesting to know about recent studies and experiments on quantum communication with satellites as quantum technology offers secure transmission. This paper demonstrates in detail description of quantum communication with satellites, its requirements and latest achievements in quantum communication with satellites.
Space offers a very unique environment for quantum physics experiments at regimes of distance and velocity not possible on ground. In the recent years there have been a range of theoretical and experimental studies towards the feasibility of performing quantum physics and quantum information science experiments in space. Such a system is possible with today's technologies and would allow to demonstrate the application of quantum secured transmission, and perform quantum optics science tests. In the near term the most promising approach is using a low-earth-orbiting (LEO) satellite either as an independent nano-sat, a piggyback payload on a larger mission, or even on the International Space Station (ISS). I will outline the envisioned quantum experiments and the requirements for the technology.
Quantum communications represent a cutting-edge frontier in secure information exchange, with satellite networks emerging as a promising platform for their implementation. This paper provides an overview of the trends and challenges in leveraging quantum technologies for satellite communications networks. Beginning with a brief introduction to quantum communications and satellite networks, the paper delves into the fundamentals of quantum key distribution (QKD), teleportation, and entanglement, highlighting their relevance to satellite-based communication systems. The paper then explores recent advancements in quantum satellite communications, including the development and deployment of quantum satellites and the achievement of long-distance quantum communication via satellites. However, alongside these advancements come notable challenges. Technical hurdles such as atmospheric interference and signal degradation over long distances pose significant obstacles to the practical implementation of quantum communication in satellite networks. Moreover, practical challenges such as high development costs, regulatory complexities, and integration issues with existing infrastructure further complicate the adoption of quantum technologies in satellite communications. Looking ahead, the paper discusses future trends and opportunities in the field, including advancements in satellite technology, integration with 5G networks, and the expansion of quantum network applications. Despite the challenges, the potential benefits of quantum communications for satellite networks are substantial, offering unparalleled security and the ability to establish secure communication channels over vast distances. By addressing the identified challenges and leveraging emerging opportunities, quantum communications hold the promise of revolutionizing satellite networks and paving the way for a new era of secure and efficient global communication.
Quantum cryptography is an emerging technology in which two parties may simultaneously generate shared, secret cryptographic key material using the transmission of quantum states of light. The security of these transmissions is based on the inviolability of the laws of quantum mechanics and information-theoretically secure post-processing methods. An adversary can neither successfully tap the quantum transmissions, nor evade detection, owing to Heisenberg's uncertainty principle. In this paper we describe the theory of quantum cryptography, and recent results from our experimental free-space system with which we have demonstrated the feasibility of quantum key generation over a point-to-point outdoor atmospheric path in daylight. We achieved a transmission distance of 0.5 km, which was limited only by the length of the test range. Our results provide strong evidence that cryptographic key material could be generated on demand between a ground station and a satellite (or between two satellites), allowing a satellite to be securely re-keyed on orbit for encrypting the uplinked command path and downlinked data path; or to distribute keys between widely-separated ground stations with a satellite relay, enabling encrypted communications over even inter-continental distances. We present a feasibility analysis of surface-to-satellite quantum key generation.
Problem statement: The security of the telecommunications satellite has become a crucial issue.The telecommunications can be set using the classical cryptography.But this so-called classical cryptography provides cryptographic security.This means that security is based on the difficulty of some mathematics problems.On the other hand, quantum cryptography provides security without conditions based on the law of quantum physics.This method, called the theoretic information security is evidenced using the theory of information.Approach: In this study, we study whether quantum cryptography can be applied in the frame of the satellite telecommunications network.To do this in our project, we present theories regarding the following issues: Telecommunications Station and Satellite Communication Networks, Quantum Key Distribution, Open Space and Satellites, Analyses in different Scenarios between the Satellite and Earth station.Results: Quantum communications offers many advantages for secure data transmission, in our implementation study, we presented different scenarios of quantum key exchange between satellites and ground stations for possible approach to subsystem with quantum communication in space, capable of generating and detecting entangled photons as well as faint laser pulses.Conclusion: The use of satellites to distribute quantum photon provides a unique solution for long-distance.Moreover, quantum cryptography is a satisfactory solution to improve the safety problem.So, the quantum transmissions are the future of telecommunications.
Quantum key distribution is now a mature quantum communication protocol which allows the verifiably secure sharing of encryption keys between two communicating parties. It seeks to address potential vulnerabilities of data transmission and storage, offering a realistic possibility to share encryption keys which are robust to eavesdropping attacks and future-proof against hacking. Fibre-optic implementations of quantum key distribution currently have a limited practical transmission distance, of less than 400 km, making commercial applications limited. Quantum-specific amplifier/repeater technology is not yet mature enough to increase the transmission distance to achieve global capabilities. Optical fiber is also impractical and expensive for applications where a remote area or moving platform are involved. In recent years, long-distance free-space quantum communications using low-Earth orbit satellites has seen an increase in interest from the academic community as well as from industrial organisations and national research institutes. The source of this new interest was a series of proof-of-principle demonstrations of satellite-based quantum key distribution in 2017. The use of free-space channels implementing airborne or satellite platforms also opens a range of new applications for quantum communications, as they allow coverage of remote areas, moving platforms, and also avoid the requirement of spooling fibre through volatile regions. This presentation will give a general introduction to satellite-based quantum communications, an overview of the field, and discuss future endeavours. The talk will also include an overview of our research into novel photonic technology, such as the use of detector array technology, for the optical ground station receiver.
The primary role played by communication in our society gives importance to the problem of securely transmitting sensitive information. Quantum physics can be exploited to solve this problem in a more secure way than it is possible by using classical protocols. The application of quantum physics to communication tasks is the basis of the new quantum communication field, of which quantum cryptography represents the most successful achievement. Quantum communication, however, suffers the presence of losses much more than classical communication. The high level of losses in fiber-based systems, limiting the maximum transmission distance to a few hundred kilometers, makes it necessary to find new ways to go further. A promising solution for extending it to a worldwide scale seems to be the use of satellites. This thesis studies some aspects of quantum communication from an experimental point of view. It presents both the study in the laboratory of quantum communication protocols and the experimental characterization of the satellite-ground channel by using a simulated space source exploiting corner-cube retro-reflectors on geodesic satellites. In addition to this, it also deals with some more technical issues of the problem, such as the construction of a high brilliance polarization-entangled photon source and the improvement of the receiving station for space quantum communication at the Matera Laser Ranging Observatory.