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Physics World

Quantum optics at a stretch

R. Loudon

Published Oct 1, 1990• 1 citation
Publisher

Abstract

Quantum optics is a research field with somewhat elastic boundaries. In its narrowest definition, the field is restricted to the study of those optical phenomena that can only be understood in terms of the quantum theory of light. Even this narrow scope includes a rich diversity of effects, and there have been particularly striking recent advances in the use of optical experiments to demonstrate aspects of fundamental quantum mechanical theory, such as vacuum fluctuations, the Bose-Einstein statistics, superposition states in particle interference, and violations of Bell's inequality.

DOI
10.1088/2058-7058/3/10/24

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Quantum optics is a research field with somewhat elastic boundaries. In its narrowest definition, the field is restricted to the study of those optical phenomena that can only be understood in terms of the quantum theory of light. Even this narrow scope includes a rich diversity of effects, and there have been particularly striking recent advances in the use of optical experiments to demonstrate aspects of fundamental quantum mechanical theory, such as vacuum fluctuations, the Bose-Einstein statistics, superposition states in particle interference, and violations of Bell's inequality.
Statistical and quantum optics provides a clear, up-to-date and comprehensive introduction to the recent field of modern optics dealing with coherence and fluctuations of light. The first two chapters discuss the statistical frame work needed for later part of the book followed by systematic account of coherence theory with a detailed discussed on photon statistics. Description of quantum theory of coherence is preceded by a introductory chapter on field quantization. A detailed description of non-classical light highlighted by phenomena of anti-bunching, Sub-Poissonian statistics, production and detection of squeezed light and coherent state follows. Next is the discussion on E-P-R paradox on reality, locality and completeness of quantum mechanics bringing out clearly the importance of Bell's inequalities. The concluding two chapters put forward forcefully the new fundamental concepts based on quantum superposition and entanglement leading to two photon interference, quantum cryptography and teleportation.
Quantum optics has offered new possibilities for experimental tests of basic principles of quantum mechanics. It enables us to experimentally investigate such phenomena as quantum interference and quantum non-locality. By means of cascade transitions or spontaneous parametric down- conversion, entangled photon pairs can be prepared. It makes possible to test the violation of Bell's inequalities and to study other issues connected with the question of completeness of quantum theory. The results of experiments of this kind pronounce in favor of quantum mechanics. The entangled pairs can further be used to demonstrate the violation of other classical inequalities, `non-local' interference in frequency domain, induced interference without induced emission, etc. They are also employed for quantum teleportation. Another family of interesting quantum optical experiments relates to single-photon interference. These experiments demonstrate wave-particle duality and correspondence between the interference visibility and the degree of knowledge of the photon's path in an interferometer. A spectacular example is the so-called interaction-free measurement. Quantum optical experiments open a new window on the quantum world and help us understand it. Further, quantum optics provides the ground for new interesting applications: quantum cryptography, quantum communications, and quantum computation.
This book provides an overview of quantum light phenomena and extends the traditional Quantum Optics, to include quantum fluids of light and the complete electromagnetic vacuum. The first part of the book includes basic electromagnetic field quantisation, the characterisation of quantum photon states and elementary photon–atom interactions. Secondly, quantum fluids of light are explored such as recent areas as Bose–Einstein condensation, light vortices and superfluid light. Finally, the last section of the book focusses on a more complete description of quantum vacuum, which includes electron–positron states. The book is intended to make the bridge between these three somewhat distinct aspects of the quantum states of light. The main audiences for the book include researchers and advanced students in quantum technology including quantum optics, metrology and computing. Part of IOP Series in Quantum Technology. Key features • Up to date review of the field, including quantum fluids of light • Extensive coverage of the topic • Key and central theme for modern quantum science and technology • Written by a respected expert in the field
Quantum optics is the field of physics describing the interaction of individual photons with matter, but in recent years it has expanded beyond pure physics to become an important driving force for technological innovation. This book starts with an elementary description of the underlying physics and then builds up a more advanced treatment. The theory begins with the quantum description of the simple harmonic oscillator, and is subsequently extended to provide the tools required to discuss coherent states, the interaction of light with atoms, entangled states, quantum noise and dissipation, linear optical amplifiers, and the fundamental issues associated with Bell's theorem. There is an equally strong emphasis on experimental methods. A quantum description of lenses, mirrors, beam splitters, Y-junctions, circulators, and stops is applied to a collection of important experiments in linear optics. A description of the most important methods of primary photon detection is followed by an explanation of heterodyne and homodyne techniques. Spontaneous down conversion and quantum tomography are discussed, together with important experimental applications. These experimental and theoretical considerations come together in a chapter briefly discussing quantum noise and its suppression in telecommunications; the limitations and possibilities for quantum cloning; the principles and techniques of quantum cryptography; and the physical basis for quantum computing.
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.