This study analyzes the advantages of three key technologies in the quantum industry (quantum computers, quantum cryptography, and quantum sensors) in Chapter 2. It analyzes the development trends of quantum technologies and the global market growth trends for each technology, such as quantum computers, which have been accelerating since around 2012; quantum cryptography, which is replacing the existing digital cryptographic communication network using QKD services; and quantum sensors, which provide the foundation for the realization of quantum computer/quantum cryptography communication technology based on the results of precise measurement of quantum states in Chapter 3. The study concludes by presenting the process of a full-fledged quantum industry in Korea and ways to improve the performance of quantum computers in Chapter 4. In order to dramatically improve the performance of quantum computers, it is necessary to understand the materials of the superposition of the two quantum states and to develop a technology development strategy that can address these shortcomings at an early stage.
This study analyzes the advantages of three key technologies in the quantum industry (quantum computers, quantum cryptography, and quantum sensors) in Chapter 2. It analyzes the development trends of quantum technologies and the global market growth trends for each technology, such as quantum computers, which have been accelerating since around 2012; quantum cryptography, which is replacing the existing digital cryptographic communication network using QKD services; and quantum sensors, which provide the foundation for the realization of quantum computer/quantum cryptography communication technology based on the results of precise measurement of quantum states in Chapter 3. The study concludes by presenting the process of a full-fledged quantum industry in Korea and ways to improve the performance of quantum computers in Chapter 4. In order to dramatically improve the performance of quantum computers, it is necessary to understand the materials of the superposition of the two quantum states and to develop a technology development strategy that can address these shortcomings at an early stage.
The article focuses on quantum technologies and the prospects for their application in the defense and security sectors. Based on an analysis of the current state of development of quantum technologies and their applications in defense and security, three main areas are identified: quantum computing, quantum communication, and quantum sensors. For each of these, a specific set of applications, advantages, and limitations is identified. It is noted that quantum computing in defense and security finds application primarily in four subfields: post-quantum cryptography, quantum cryptography, cyber threat detection, and cryptanalysis; quantum communication ensures secure information transmission by utilizing the physical properties of quantum states, particularly the principle of the impossibility of cloning a quantum state, with its primary practical application being Quantum key distribution and its promising application being the quantum internet; quantum sensors are the category of quantum technologies closest to operational deployment, as they utilize the hypersensitivity of quantum states to external disturbances to achieve measurement accuracy unattainable by classical devices. A summary of the main areas of application for quantum technologies in defense and security indicates that quantum sensors have the nearest practical implementation horizon (5–7 years), while quantum computing will have the greatest strategic impact on cryptographic infrastructure due to the threat it poses to existing asymmetric encryption algorithms—which is precisely why the transition to post-quantum standards is becoming urgent. Therefore, given the significant interest in and funding for quantum technologies from both the civilian industry and governments, it is expected that these technologies will continue to develop and new quantum applications will become available over the next five to ten years, and new advances in the development of quantum technologies may bring new opportunities for the military, but for the military to actually reap the benefits of new quantum technologies, they need to actively engage in this field and guide the development and implementation of military applications of quantum technologies.
Quantum computing is a new technology that may result in a revolution in the way data is transferred around the globe. However, it also has quite serious risks for existing cryptographic systems and thus, many encryption methods are insecure against quantum attacks. Future security frameworks will incorporate advanced quantum cryptography to overcome these issues. The use of post-quantum algorithms post-quantum algorithms and quantum key distribution quantum key distribution based on their fundamental concepts are strong defenses, according to quantum cryptography against quantum adversaries. Quantum cryptography is also demonstrated in its application to practical scenarios in important sectors such as infrastructure, healthcare, banking, and defense. Quantum cryptography and its potential to improve the global cybersecurity ecosystems through the integration of cutting-edge research and feasible methods of implementation are presented. It also describes the functions of quantum cryptography in securing private communications, maintaining data reliability, and handling the peculiar challenges of quantum threats. This work also focuses on how quantum cryptography is transforming security concepts and how this transformation is necessary to ensure the future of communication networks. The study reveals how quantum cryptography can transform the way secure communications are established and form the foundation of the digital society through the integration of theoretical ideas and practical applications.
The development of quantum mechanics and quantum physics in general is one of the greatest intellectual achievements of the 20th century. Initially, quantum physicists focused on mathematically describing and understanding the laws of a micro-world, comprised of atoms, molecules and photons. Nuclei and sub-atomic particles were discovered, particle physics evolved, and complex quantum systems in chemistry and solid-state physics are now described in terms of quantum physics. Within a century, quantum physics became the framework, which allows us to describe and predict, albeit with probabilities, the behavior of the microscopic world as we know it. The powerful quantum framework led to revolutionary technical advances for a century, such as semiconductor technology and the entire electronics industry based on it, enabling computers and the information age. The development of lasers found applications in many areas of our current technologies; we use them for printers, storing and retrieving information using CDs, industrial welding, medical surgery, and for range finding and communication purposes. Medical imaging using MRI is now a routine instrument, as are precision measurements using tunneling and atomic force microscopes. Superconducting technologies are used for high magnetic fields and many more current technologies are based on and enabled by the laws of quantum physics. While the framework of quantum physics has thus proven to be extremely successful and powerful, throughout the last century there were many conceptual, and to some extent philosophical, discussions on our understanding of quantum physics. As early as the 1930s, Einstein and Schrödinger realized that quantum physics allows for some peculiar states, which Schrödinger called “entangled”, which have a non-local character and thus do find an easy interpretation in our classical world. It took a few more decades until John Bell conceived a way to quantify such states, which thus became amenable to measurements. Only in the eighties and nineties of the last century did the generation of entangled states, their characterization and their subsequent application become feasible and accessible in laboratories. Early on, Bell states were proposed for applications in quantum communication, employing protocols based on teleportation. Soon, entanglement was recognized to be useful also for sensing, for precision measurements and eventually for quantum information processing. Starting with the early concept of a trapped-ion quantum computer introduced by Ignacio Cirac and Peter Zoller in 1995, many other platforms were proposed for quantum information processing, based on superconducting quantum bits, photonic processes, engineered quantum dots and many more. The first decade of the 21st century saw an explosive development of quantum information physics, which is by now a mature field and increasingly focuses on applications. Worldwide efforts are ongoing to realize quantum networks for secure communication and to implement quantum computers. Enhanced sensing has been demonstrated using advanced quantum states, and quantum simulators have been developed, already tackling problems that are hard to compute with classical computers. While architectures for full-fledged quantum computers are already available, the realization of such computers still requires the routine implementation of error correction, which is not yet available, for full scalability. Currently, noisy intermediate-scale quantum (NISQ) processors are already used for computations and are even accessible via cloud services. Since about 2000, quantum technologies have been developed for many platforms with the aim to surpass the capablities of their classical counterparts. Many such devices now make use of entangled states, which are seen as the new resource for advanced quantum technologies. For this, describing, understanding and generally mastering the generation and manipulation of entanglement is a key element. Moreover, both hardware and software technologies have to be improved in order to better control quantum devices. Mastering quantum phenomena for communication, metrology, simulation and computation purposes is currently one of the hottest topics in science since the wide applicability of quantum technologies will revolutionize these fields. The development of advanced quantum technologies is thus seen worldwide as a strategic area for generating technical knowledge and industrial evolution. This special issue intends to showcase the breadth and impact of the ongoing research in advancing quantum technologies. We have invited a selection of renowned scientists to present their work, and we are confident that this issue will find a broad readership and attract much interest within the scientific community.
Quantum computing emerged as a promising field with the potential to revolutionize various industries. It exists in a unique space within the purview of modern computing technologies. It leverages the exclusive properties offered by quantum physics to process information in ways classical computing cannot achieve. There are several promising implications of quantum computing which transcend across industries – simulating molecular structures for drug discovery, modeling global weather patterns, optimizing traffic flows, and factoring large numbers for cryptography, among several others. This chapter explores the path lying ahead in quantum computing and the associated challenges. It highlights the concept of ‘Quantum Supremacy’, the point at which quantum computers surpass classical computers in computational capabilities. The discussion revolves around the implications of reaching this milestone, especially concerning cybersecurity due to potential vulnerabilities in current cryptographic systems. It further addresses the challenges that bar the full-scale practical implementation of quantum computers, such as error correction, stability, and developing quantum algorithms. Extensively, it also focuses on quantum-resistant algorithms and cryptographic systems. The exploration of these post-quantum cryptography scenarios is regarded as crucial in ensuring our preparedness for a post-quantum supremacy world. The chapter emphasizes active research, innovation, and commitment across government, academia, and industry globally to navigate these challenges successfully and leverage the quantum revolution's benefits.
Quantum computing stands poised to revolutionize digital hardware by offering computational capabilities that fundamentally transcend classical computing limitations. The global quantum computing market demonstrates substantial growth fueled by investments from major technology corporations as they race toward achieving practical quantum advantages. Despite formidable technical challenges—including the need for extremely low operating temperatures and error correction—significant advancements have been made in reducing error rates and increasing qubit counts. Novel architectures like Amazon's "Ocelot" cat qubits, Microsoft's topological quantum computing and Nvidia's accelerated quantum supercomputing that integrates quantum hardware with AI supercomputers address persistent challenges in error rates and qubit coherence. These developments open new frontiers in previously intractable problems across multiple domains, from cryptography to materials science and artificial intelligence. As the field progresses from the Noisy Intermediate-Scale Quantum era toward fault-tolerant quantum computing, it faces four critical challenges: scalability, error correction, quantum-classical integration, and algorithm development. Addressing these challenges will enable quantum computing to fulfill its transformative potential across industries, fundamentally reshaping computational technology.
Quantum science and quantum technology have become significant areas that have the potential to bring up revolutions in various branches or applications including aeronautics and astronautics, military and defense, meteorology, brain science, healthcare, advanced manufacturing, cybersecurity, artificial intelligence, etc. In this study, we present the advances and trends of quantum technology. Specifically, the advances and trends cover quantum computers and Quantum Processing Units (QPUs), quantum computation and quantum machine learning, quantum network, Quantum Key Distribution (QKD), quantum teleportation and quantum satellites, quantum measurement and quantum sensing, and post-quantum blockchain and quantum blockchain. Some challenges are also introduced.