Light has provided both fundamental phenomenology and enabling technology for scientific discovery for many years, and today it continues to play a central role in fundamental explorations and innovative applications. The ability to manipulate light beams and pulses with the quantum degrees of freedom of optical radiation will add to those advances. The future of quantum optics, which encompasses both the generation and manipulation of nonclassical radiation, as well as its interaction with matter, lies in the rich variety of quantum states that is now becoming feasible to prepare, together with the numerous applications in sensing, imaging, metrology, communications, and information processing that such states enable.
Light has provided both fundamental phenomenology and enabling technology for scientific discovery for many years, and today it continues to play a central role in fundamental explorations and innovative applications. The ability to manipulate light beams and pulses with the quantum degrees of freedom of optical radiation will add to those advances. The future of quantum optics, which encompasses both the generation and manipulation of nonclassical radiation, as well as its interaction with matter, lies in the rich variety of quantum states that is now becoming feasible to prepare, together with the numerous applications in sensing, imaging, metrology, communications, and information processing that such states enable.
Quantum optics is the branch of physics that investigates the interaction of light with matter at the quantum level, where the discrete nature of photons and quantum states of atoms, molecules, and solid-state systems become dominant. Quantum optics systems provide the experimental and theoretical foundation for understanding nonclassical states of light, quantum coherence, entanglement, and measurement at the quantum limit. Over the past few decades, advances in laser technology, nonlinear optics, and precision measurement have transformed quantum optics from a fundamental discipline into a key enabler of quantum technologies, including quantum communication, quantum computing, quantum sensing, and quantum metrology. This review presents a comprehensive overview of the physical principles, system architectures, and experimental platforms of quantum optics. Emphasis is placed on light sources, atom–photon interaction systems, detection techniques, and emerging applications, along with current challenges and future research directions.
Abstract In today’s rapidly evolving quantum landscape, the generation and manipulation of quantum light not only represent fundamental challenges but also herald unprecedented opportunities in communication, computing, sensing, and imaging. This special issue brings together a collection of contributions that span the entire journey, from the creation of quantum light using novel materials and emitters to its seamless integration into photonic architectures and eventual deployment in advanced quantum applications. This special issue, “ Quantum Light: Creation, Integration, and Applications ,” features a collection of three review articles, five perspectives, and 23 original research papers, highlighting both the timeliness of the topic and the remarkable breadth and richness of ongoing advancements in the field.
Our ability to manipulate the coherence properties of light has been at the heart of many of the most important scientific and technological innovations of this century. There can hardly be a home in this country that does not possess a laser in the form of a compact disc player or a CDROM. When we talk on the phone, or send messages on the Internet, there is a high probability that our message will be encoded by a laser into pulses of light to be passed through optical fibres. In the last few years physicists have been discovering that it is possible to control the coherence properties of atoms, and are now developing tools analogous to those which have been developed to take advantage of the coherence properties of light. In the next decade we can look forward to seeing the application of lasers, fibres, mirrors and waveguides for atoms. Already we have been able to construct interferometry experiments using beams of atoms and these have proved to be extremely sensitive measurement devices, allowing us to test physical theories and measure fundamental constants to a level of precision not previously possible. Will these developing technologies ever be as ubiquitous as their optical forebears? In this paper we discuss the anticipated uses of this technology for both fundamental science and industrial applications. Starting from an explanation of the meaning of coherence and a comparison of the properties of photons and atoms, we describe the development of the science of atom optics. The tortuous route towards the great achievement of producing a Bose–Einstein condensate is described, and we explain why this is the most important step towards a laser–like source of atoms. Numerous other optical elements for atoms have been built or are on the drawing board, and we describe how these may be used to manipulate atoms with a precision that has never before been achieved, and look ahead to what we can learn about physics using these tools and at how they can be put to practical use.
Optical metasurfaces, i.e., subwavelength planar nanostructures, have attracted increasing attention due to their unprecedented capabilities of molding classical light and revolutionized conventional optics by replacing bulky optical components with ultrathin, lightweight, and ultracompact meta-optics. In addition to controlling classical light, meta-optics demonstrate the potential to efficiently manipulate nonclassical light and start to enter the realm of quantum photonics. Here, we briefly overview recent advances in quantum meta-optics for generation and manipulation of nonclassical light, highlighting innovative approaches, and discuss future opportunities in this burgeoning area, ranging from fundamental research to practical applications.
The second quantum revolution, Quantum 2.0, is fueled by recent progress in generating and manipulating quantum states in both light and matter, leading to new applications such as quantum sensing, computing, and communications. These new applications, which leverage unique quantum properties, such as superposition, entanglement, and measurement sensitivity of quantum states to offer fundamental advantages over classical technologies, are in principle enabled by the Quantum 1.0 technologies such as lasers. As quantum information science and technology progresses steadily from a purely academic discipline towards technology demonstrations, the imperative to transition from laboratory-grade lasers to industry-grade lasers becomes evident in the quest for scalability, robustness, improved performance, and often, reduced SWaP (Size, Weight, and Power) for field deployability. This paper provides an overview of the current state and challenges of laser-enabled quantum applications and outlines the advancements in laser technologies from macro-optics to micro-optics to integrated photonics with their prospects towards the practical realization of quantum advantage.
Quantum optics, the study of light and its interactions with matter at the quantum level, has revolutionized modern telecommunications. By leveraging quantum phenomena such as entanglement, superposition, and photon manipulation, quantum optics enables ultra-secure communication, high-speed data transfer, and novel computing paradigms. The integration of quantum technologies into emerging communication infrastructures, particularly 6G networks, is becoming increasingly critical for overcoming the inherent limitations of classical communication and computation. In summary, quantum optics and quantum information have profoundly influenced modern physics and technology, where the field continues to bridge fundamental research and practical applications, promising further innovations in the future. The exponential growth of data traffic necessitates advancements in secure and high-speed communication technologies. Classical telecommunications rely on electromagnetic waves, but quantum optics introduces fundamentally new capabilities by exploiting quantum states of light. This paper explores the fundamental principles of quantum optics, its applications in quantum key distribution (QKD), quantum teleportation, and quantum repeaters, and its impact on next-generation telecommunications. We also discussed challenges and future prospects of the quantum optics in telecommunications.