The rapid development of quantum information has brought new opportunities and challenges to modern information technologies.As one of the popular research directions in the field of quantum information, quantum networks aim to utilize the fundamental properties of quantum mechanics to achieve long-distance (secure) communications or provide computational capabilities superior to classical computing networks through distributed computing.The study of quantum networks holds great significance in advancing the practicality of quantum information.To gain a comprehensive understanding of the development trajectory of quantum networks, this study categorizes quantum networks into three types: quantum cryptography, quantum cloud computing, and quantum teleportation networks, based on different application scenarios and technical approaches.It provides comprehensive reviews of both domestic and international research progress and the challenges faced in each aspect.Furthermore, in conjunction with the practical implementation of quantum networks, the key technologies that need to be overcome in the development of quantum network systems, involving link establishment, information transmission, networking protocols, and physical hardware, are summarized.Overall, the development of quantum networks is still in the primary stage.At this stage, actively addressing challenges and seizing opportunities are of great significance to enhance the technological prowess of China.Therefore, to promote the development of 收稿日期：2023-10-11；修回日期：2023-10-30 通讯作者： * 高飞，网络与交换技术国家重点实验室(北京邮电大学)教授，研究方向为量子密码和量子算法；E-mail:
The rapid development of quantum information has brought new opportunities and challenges to modern information technologies.As one of the popular research directions in the field of quantum information, quantum networks aim to utilize the fundamental properties of quantum mechanics to achieve long-distance (secure) communications or provide computational capabilities superior to classical computing networks through distributed computing.The study of quantum networks holds great significance in advancing the practicality of quantum information.To gain a comprehensive understanding of the development trajectory of quantum networks, this study categorizes quantum networks into three types: quantum cryptography, quantum cloud computing, and quantum teleportation networks, based on different application scenarios and technical approaches.It provides comprehensive reviews of both domestic and international research progress and the challenges faced in each aspect.Furthermore, in conjunction with the practical implementation of quantum networks, the key technologies that need to be overcome in the development of quantum network systems, involving link establishment, information transmission, networking protocols, and physical hardware, are summarized.Overall, the development of quantum networks is still in the primary stage.At this stage, actively addressing challenges and seizing opportunities are of great significance to enhance the technological prowess of China.Therefore, to promote the development of 收稿日期：2023-10-11；修回日期：2023-10-30 通讯作者： * 高飞，网络与交换技术国家重点实验室(北京邮电大学)教授，研究方向为量子密码和量子算法；E-mail:
Quantum networks are a rapidly evolving technology that utilizes the principles of quantum mechanics to facilitate secure communication, distributed quantum computing, and highly sensitive sensor networks. Quantum networks are constructed using diverse components, such as quantum information sources, quantum memories, quantum repeaters, and quantum detectors. These networks leverage the distinctive features of quantum mechanics, such as superposition and entanglement, to attain superior performance benefits. Despite the numerous challenges that impede the development of quantum networks, such as the requirement for more efficient and dependable components, considerable advancements have been achieved in recent years through the utilization of simulations and experimental platforms. With the growing need for enhanced security and faster computing, the potential for quantum networks appears promising in the future. The potential of these innovations to revolutionize various fields and facilitate novel breakthroughs and discoveries is noteworthy. In this paper, we review the current state of the art in quantum networks, including key concepts and technologies such as quantum key distribution, quantum repeaters, and quantum routing. We also discuss some of the key challenges in quantum networks, including scalability, noise, and interoperability, and highlight some of the key research directions in this field. Finally, we discuss some of the potential applications of quantum networks, including secure communication, quantum computing, and quantum sensing. This paper provides a comprehensive overview of the current status and future directions of quantum networks and will be of interest to researchers, engineers, and policymakers working in this field.
Quantum networks are a rapidly evolving technology that utilizes the principles of quantum mechanics to facilitate secure communication, distributed quantum computing, and highly sensitive sensor networks. Quantum networks are constructed using diverse components, such as quantum information sources, quantum memories, quantum repeaters, and quantum detectors. These networks leverage the distinctive features of quantum mechanics, such as superposition and entanglement, to attain superior performance benefits. Despite the numerous challenges that impede the development of quantum networks, such as the requirement for more efficient and dependable components, considerable advancements have been achieved in recent years through the utilization of simulations and experimental platforms. With the growing need for enhanced security and faster computing, the potential for quantum networks appears promising in the future. The potential of these innovations to revolutionize various fields and facilitate novel breakthroughs and discoveries is noteworthy. In this paper, we review the current state of the art in quantum networks, including key concepts and technologies such as quantum key distribution, quantum repeaters, and quantum routing. We also discuss some of the key challenges in quantum networks, including scalability, noise, and interoperability, and highlight some of the key research directions in this field. Finally, we discuss some of the potential applications of quantum networks, including secure communication, quantum computing, and quantum sensing. This paper provides a comprehensive overview of the current status and future directions of quantum networks and will be of interest to researchers, engineers, and policymakers working in this field.
In the early decades of the 20th century, the inception of quantum mechanics catalyzed the first quantum revolution, resulting in groundbreaking technological advances, such as nuclear energy, semiconductors, lasers, nuclear magnetic resonance, superconductivity, and global satellite positioning systems. These innovations have promoted significant progress in material civilization, fundamentally changed the way of life and societal landscape of humanity. Since the 1990s, quantum control technology has made significant strides forward, ushering in a rapid evolution of quantum technologies, notably exemplified by quantum information science. This encompasses domains such as quantum communication, quantum computing, and quantum precision measurement, offering paradigm-shifting solutions for enhancing information transmission security, accelerating computational speed, and elevating measurement precision. These advances hold the potential to provide crucial underpinning for national security and the high-quality development of the national economy. The swift progression of quantum information technology heralds the advent of the second quantum revolution. Following nearly three decades of concerted efforts, China’s quantum information technology field as a whole has achieved a leap. Specifically, China presently assumes a prominent international role in both the research and practical application of quantum communication, leading the global domain in quantum computing, and achieving international preeminence or advanced standing across various facets of quantum precision measurement. Presently, it is imperative to conduct a comprehensive assessment of the developmental priorities in the realm of quantum information in China for the forthcoming 5 to 10 years, in alignment with national strategic priorities and the evolving landscape of international competition. This will enable the proactive establishment of next-generation information technology systems that are secure, efficient, autonomous, and controllable.
Abstract - Quantum networking represents one of the most transformative developments in modern secure communication. Unlike classical networks that rely on mathematical encryption, quantum networks exploit the physical properties of qubits—superposition, entanglement, and the no-cloning theorem—to establish communication channels that are inherently tamper-evident. As quantum technologies mature, applications such as quantum key distribution (QKD), quantum repeaters, quantum teleportation, quantum memory systems, and quantum internet protocols are gaining global traction. This paper consolidates current progress in quantum networking technologies and provides an extended discussion of recent advancements in protocols, hardware components, integrated photonic systems, and machine-learning-enhanced architectures. Additionally, results synthesized from established literature, illustrate performance trends, security gains, and practical deployment challenges in quantum communication networks. The paper also outlines future directions toward scalable quantum internets, hybrid quantum-classical infrastructures, error-corrected qubit networks, satellite-based QKD, and intelligent routing systems. Overall, quantum networking is positioned to redefine the future of secure data transfer, distributed computing, and global communication infrastructures. Key Words: Quantum networking, Quantum Key Distribution (QKD), Entanglement Distribution, Integrated Photonic Chips, Machine Learning (ML)
With the recent advancements and developments in quantum technologies, the emerging field of quantum communication and networking has gained the attention of the researchers. Owing to the unique properties of quantum mechanics, viz., quantum superposition and entanglement, this new area of quantum communication has shown potential to replace modernday communication technologies. The enhanced security and high information sharing ability using principles of quantum mechanics has encouraged networking engineers and physicists to develop this technology for next generation wireless systems. However, a conceptual bridge between the fundamentals of quantum mechanics, photonics and the deployability of a quantum communication infrastructure is not well founded in the current literature. This paper aims to fill this gap by merging the theoretical concepts from quantum physics to the engineering and computing perspectives of quantum technology. This paper builds the fundamental concepts required for understanding quantum communication, reviews the key concepts and demonstrates how these concepts can be leveraged for accomplishing successful communication. The paper delves into implementation advancements for executing quantum communication protocols, explaining how hardware implementation enables the achievement of all basic quantum computing operations. Finally, the paper provides a comprehensive and critical review of the state-of-the-art advancements in the field of quantum communication and quantum internet; and points out the recent trends, challenges and open problems for the real-world realization of next generation networking systems.
After nearly three decades of rapid development, the quantum information technology in the theoretical and technical studies has gained remarkable achievements. This review gives a brief introduction to the development of various hot research branches of quantum information technology, including quantum cryptography, quantum communication, quantum computing, quantum simulation, quantum metrology, and fundamental theory of quantum information. In addition, this review also discusses various physical systems which have been well applied in the quantum information technology, such as atomic, molecular and optical physics, different branches in solid state physics (superconducting Josephson Junction system, semiconductor quantum dots, Nitrogen-vacancy color centers in diamond), trapped ions, and nuclear magnetic resonance system. With the investigation and accumulation of quantum information technology, the ability to control microscopic world has been significantly improved. Quantum cryptography has been close to the practical application and the long-distance quantum communication has overcome the practical obstacles in principle. Quantum simulation is close to the limit of the classical computer. Also, quantum metrology has gained rapid development. This review not only shows the situation of the international development of quantum information technology, but also highlights the achievements of China in recent years. These achievements demonstrate that China is an indispensable force in the worldwide quantum information community.