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IEEE Communications Magazine

Quantum Networking for Secure and Reliable Communication in Space Exploration

Luca Borgianni, Davide Adami, Stefano Giordano

Published Oct 1, 2024• 3 citations
Publisher

Abstract

In the coming years, space missions will increasingly require communication systems capable of ensuring high-performance, safe, and reliable data transmission between ground stations and spacecraft. Since classical communication systems will be inadequate and have enormous limitations, this article intends to analyze the potential of quantum networking in addressing future challenges of space communications. We introduce well-known phenomena of quantum mechanics, such as non-cloning, entanglement, quantum measurement, and quantum teleportation, which open up a completely new scenario in the design of the communication network. Finally, we propose a network architecture for space exploration, aiming to take a look at the potential of quantum technology to establish communication between Earth and spacecraft by integrating terrestrial and non-terrestrial quantum networks.

DOI
10.1109/mcom.004.2300837

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In the coming years, space missions will increasingly require communication systems capable of ensuring high-performance, safe, and reliable data transmission between ground stations and spacecraft. Since classical communication systems will be inadequate and have enormous limitations, this article intends to analyze the potential of quantum networking in addressing future challenges of space communications. We introduce well-known phenomena of quantum mechanics, such as non-cloning, entanglement, quantum measurement, and quantum teleportation, which open up a completely new scenario in the design of the communication network. Finally, we propose a network architecture for space exploration, aiming to take a look at the potential of quantum technology to establish communication between Earth and spacecraft by integrating terrestrial and non-terrestrial quantum networks.
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This article will explore the design and implementation of quantum networks in space integrated with quantum networks on Earth. We propose a three-layer approach, involving GEO and LEO satellites integrated with terrestrial ground stations. We first analyze the channel conditions between the three layers, and then highlight the key role of LEO satellites in the integrated space-terrestrial system – namely the source of entanglement distribution between specified terrestrial stations via direct downlink quantum-optical channels. The GEO satellites in the considered system are used primarily as “coordination” stations, managing and directing the LEO satellites regarding the positioning and timing of entanglement distribution. Complexity, in the form of entanglement distillation and quantum-state correction, is concentrated at the terrestrial stations, and teleportation is used as the primary quantum channel in the LEO uplinks and the inter-terrestrial channels. Although our designs are futuristic in that they assume limited quantum memory at the transceivers, we also discuss some near-term uses of our network in which no quantum memory is available.
Driven by quantum superposition and entanglement, the swift advancement of quantum computing has highlighted the limitations of classical computation. As a solution, Quantum Networks (QNs) have emerged, offering high-quality entanglement connections and reliable quantum state transmission, enabling a range of applications that exceed the limitations of classical data networks, including quantum communication and distributed quantum computing (DQC). This article delves into key components and concepts such as quantum entanglement, quantum decoherence and entanglement distribution. It then explores quantum remote secure communication technologies, including quantum teleportation, quantum key distribution (QKD), quantum dense coding, quantum repeater technology, and quantum satellite communication. We also provide a detailed introduction to quantum remote entanglement distribution and quantum entanglement routing design, including current research progress and a discussion on the challenges and existing solutions for constructing large-scale QNs. The aim of this article is to provide readers with a fundamental understanding of QNs, an assessment of current research, and insights into the main challenges and solutions in this emerging field. Through these discussions, we hope to help readers better understand the potential and future direction of QNs.
Quantum communication infrastructures are being built worldwide to establish a quantum secure communication shield across geographical areas to protect economies, societies, and individuals from cyberthreats. It is a first step toward interconnecting nodes with classical/quantum communication, computation, and storage capabilities. However, insufficient emphasis has been placed on the fact that such infrastructure will not operate like classical networks, even though they must operate in conjunction with classical networks. In particular, classical and quantum resources can be generated and/or consumed to realize quantum protocols (e.g., a teleportation protocol consumes two classical information bits and one entanglement bit (ebit) to deliver one quantum bit (qubit)). This fundamental paradigm shift with respect to current (Shannon) classical communication brings fundamental network design challenges. In this work, we focus on the increasingly relevant space-terrestrial integrated networks, and investigate such challenges. First, we introduce the interplay between classical and quantum network resources according to the underlying theoretical limits band, and justify why the problem is significant and needs to be addressed urgently. Second, we present two illustrative numerical analyses: trade-offs between classical-quantum and classical-entanglement capacities, both over space channels. We identify (both technical and policy/ethical) research challenges ahead for the staged development of integrated quantum-classical networks as the required quantum technology becomes available. Finally, we identify the synergies with 6G usage scenarios endorsed by ITU-R.