Today’s Internetis a global communications network used to transfer, process,and store classical information. The quantum Internetis a hypothetical high-speed Internetthat provides ultra-secure connectivity to quantum devices across the globe. Itis a network of quantum computers that will someday send, compute, and receive information encoded in quantum states.It is a communications network that will transform industries, increase security, and alter the way we transmit information. While quantum computers exist in the physical world, the concept of quantumInternetis currently theoretical.In its infant form, the quantum Internetpromises to make the digital domain safer, more productive,and more powerful than ever before.In this study, we provide a primer on quantum Internet, which provides a large-scale application of advanced quantum communication technologies and protocols.
Today’s Internetis a global communications network used to transfer, process,and store classical information. The quantum Internetis a hypothetical high-speed Internetthat provides ultra-secure connectivity to quantum devices across the globe. Itis a network of quantum computers that will someday send, compute, and receive information encoded in quantum states.It is a communications network that will transform industries, increase security, and alter the way we transmit information. While quantum computers exist in the physical world, the concept of quantumInternetis currently theoretical.In its infant form, the quantum Internetpromises to make the digital domain safer, more productive,and more powerful than ever before.In this study, we provide a primer on quantum Internet, which provides a large-scale application of advanced quantum communication technologies and protocols.
A revolution was sparked by the introduction of the internet to the world. In every domain, it has expanded the application scope, and it is still growing. Throughout history, there were many sources of information, including those not connected to computers. Throughout our whole computing process, we have dealt with this information. Unlike classical computers, quantum computers exhibit certain properties. A quantum device is a device whose operation is governed by quantum physics. In order to implement such advanced communication among quantum devices or computers, a link that can provide the same level of security and allow for such secure communication has to be created. When quantum internet and classical internet are effectively used together, we can achieve unparalleled capabilities with quantum information processing. Our survey paper has discussed more of the technologies that make up quantum internet and its concept.
The Quantum Internet represents a paradigm shift in communication technology, leveraging quantum mechanical principles such as superposition, entanglement, and the no-cloning theorem to enable ultra-secure, high-fidelity, and potentially revolutionary global connectivity. Unlike the classical internet, which transmits bits through electromagnetic signals, the Quantum Internet transmits qubits, allowing the creation of unbreakable cryptographic channels, distributed quantum computation, and quantum-enhanced sensing networks. This paper presents a comprehensive review of the Quantum Internet, covering its underlying principles, layered architecture, enabling hardware technologies, and core communication protocols. We analyze current and emerging applications, from secure government and financial communications to healthcare and fundamental physics experiments. The study highlights the unique advantages of quantum networking, such as intrinsic security against eavesdropping, global-scale entanglement distribution, and integration with distributed computing infrastructures. At the same time, it addresses practical limitations, including distance constraints, quantum memory coherence times, infrastructure costs, and security risks associated with hardware vulnerabilities. Special attention is given to the feasibility of large-scale deployment in India, leveraging national programs such as NM-QTA and QuEST, as well as satellite-based quantum communication initiatives by ISRO. The paper concludes with a roadmap for the realization of a global quantum network, identifying technical, infrastructural, and policy challenges that must be addressed in the coming decades.
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 future of the Internet and of computer communication goes through modern physics. Using the new properties of quantum mechanics, various research laboratories around the world are building prototypes of “quantum networks”, a new way that uses some quantum physics principles to deliver information packets. In the near future our data will be able to travel on the Internet at very high speed, also greater than the speed of light, thanks to the quantum network. Independent research groups have already been able to demonstrate the entanglement of photons on fiber optic networks in China and Canada. The result can be considered as the first step for the realization of quantum telematic networks on a metropolitan scale and the connection at large distances of future computers based on quantum physics. But the quantum computer will be such a powerful system that can even damage the security of our systems and networks as we know them today, as well as to personal privacy, already threatened by current network rules.
The advanced notebooks, mobile phones, and internet applications in today’s world that we use are all entrenched in classical communication bits of zeros and ones. Classical internet has laid its foundation originating from the amalgamation of mathematics and Claude Shannon’s theory of information. However, today’s internet technology is a playground for eavesdroppers. This poses a serious challenge to various applications that rely on classical internet technology, and it has motivated the researchers to switch to new technologies that are fundamentally more secure. By exploring the quantum effects, researchers paved the way into quantum networks that provide security, privacy, and range of capabilities such as quantum computation, communication, and metrology. The realization of Quantum Internet (QI) requires quantum communication between various remote nodes through quantum channels guarded by quantum cryptographic protocols. Such networks rely upon quantum bits (qubits) that can simultaneously take the value of zeros and ones. Due to the extraordinary properties of qubits such as superposition, entanglement, and teleportation, it gives an edge to quantum networks over traditional networks in many ways. At the same time, transmitting qubits over long distances is a formidable task and extensive research is going on satellite-based quantum communication, which will deliver breakthroughs for physically realizing QI in near future. In this paper, QI functionalities, technologies, applications and open challenges have been extensively surveyed to help readers gain a basic understanding of the infrastructure required for the development of the global QI.
Classical communication is the basis for many of our current and future technologies, such as mobile phones, video conferences, autonomous vehicles and particularly the internet. In contrast, quantum communication is governed by the laws of quantum mechanics. Due to this fundamental difference, it might offer enormous benefits for security applications, more precise measurements, faster computations, and many other fields of application by interconnecting different quantum devices, such as quantum sensors, quantum computers, or quantum memories. This review provides an overview of the specific properties of quantum information networks. This includes the interfaces between the classical and the quantum regime, the transmission of the quantum information by physical implementations, and potential future applications of quantum networks. We aim to provide a starting point based on fundamental concepts of quantum information processing for further research on a future quantum internet.