TL;DR
This study highlights the gap between theoretical developments and real-world deployment, and outlines future research directions required for building scalable and practical quantum network infrastructures.
Quantum communication is an emerging field that promises to revolutionize data transmission by leveraging the principles of quantum mechanics. This paper explores the fundamental concepts, underlying principles, and potential impact of quantum communication on future data transmission systems. The study delves into quantum key distribution (QKD), quantum teleportation, and quantum networks, highlighting their advantages over classical communication systems. A comparative analysis of classical cryptographic methods and quantum-enhanced security mechanisms is provided. Furthermore, the paper discusses the challenges associated with implementing quantum communication, such as decoherence, quantum error correction, and scalability. The methodology section outlines experimental setups, simulations, and practical implementations of quantum communication networks. The results emphasize the benefits of quantum encryption and the potential of quantum internet. The discussion explores real-world applications in banking, defense, and cloud computing. Finally, the paper concludes with future perspectives, emphasizing the necessity for ongoing research and technological advancements to achieve a fully functional quantum communication infrastructure.
Quantum networks play a pivotal role in quantum information science, which not only provide a secure communication platform for remote access to quantum computers but also serve as the strategic core for achieving large-scale quantum information processing, forming the foundational infrastructure for the future global-scale quantum internet. Quantum teleportation, which enables the transmission of unknown quantum states over long distances by employing quantum entanglement together with classical communication, is essential for the distribution of quantum resources in the construction of the global-scale quantum internet. To realize a global-scale quantum internet, quantum repeater protocols represent one of the most promising approaches for enabling quantum communication between any nodes. This concise review presents representative experimental demonstrations of quantum teleportation for constructing quantum networks across different physical platforms. Along this trajectory, the review discusses current challenges, open issues, and future perspectives toward scalable and practical quantum internet.
The realization of large-scale quantum networks requires more than advances in quantum repeaters, memories, and processors, it requires a framework explaining how heterogeneous quantum technologies evolve from isolated deployments into interconnected infrastructures. While the classical Internet evolved under strong utility incentives associated with resource sharing and communication demands, quantum networking currently lacks dominant applications capable of generating comparable incentives. As a consequence, contemporary quantum networks are largely formed through technology-driven decisions motivated by technical feasibility, experimental validation, and expected future value. This work argues that the absence of utility-driven network formation is not solely a consequence of immature applications, but also of insufficient abstraction. In particular, heterogeneous quantum platforms remain tightly coupled to the functionalities they provide, preventing the definition of technology-independent utility functions. A hierarchical architecture consisting of Physical Platforms (PP), Functionalities (F), Services (S), Applications (A), and Use-Cases (UC) is proposed, together with the argument that quantum interconnects constitute the enabling technology required to decouple physical implementations from network functionalities. Such decoupling permits the definition of utility functions at the functionality level and establishes the conditions under which strategic (agent-based) network formation becomes applicable. Quantum interconnects should therefore be viewed not only as interoperability devices, but also as fundamental enablers of strategic quantum network evolution.
This study proposes a novel scheme for distributing GHZ-equivalent states across repeater-based quantum networks, with particular focus on the analysis and mitigation of decoherence effects during transmission. The proposed scheme enables remote users to share graph states, which can be leveraged to implement various quantum communication protocols, such as quantum key distribution and quantum secret sharing. Compared with existing approaches, the proposed distributed scheme requires only O(N) qubits without introducing redundant entanglement structures. Together with the linear-scaling merging procedure in both controlled gate count and qubit usage, the proposed framework supports more efficient large-scale graph state distribution. To evaluate its feasibility and correctness, this study utilizes the quantum network simulation tool, NetSquid, to implement the proposed scheme. Simulation results demonstrate that the proposed approach is both effective and practical for executing quantum communication protocols within quantum networks.
In this work, we discuss the main concepts, critical photonic resources, present efforts and challenges ahead aiming at the deployment of quantum communication networks at various stages of development and at a scale of data centres or global infrastructures. We present examples of applications of such networks spanning from ultra-secure communication to advanced cryptographic and communication protocols in distributed architectures. We argue that optical quantum networking, powered by entanglement as a fundamental resource and enhanced by highly efficient quantum memories, is key for scaling up quantum technologies, pursued by rapid advancements towards technological maturity and leading the path to an era of quantum connectivity.