Quantum Optics

Quantum optics, i.e. the interaction of individual photons with matter, began with the discoveries of Planck and Einstein, but in recent years, it has expanded beyond pure physics to become an important driving force for technological innovation. This book serves the broader readership growing out of this development by starting with an elementary description of the underlying physics and then building up a more advanced treatment. The reader is led from the quantum theory of the simple harmonic oscillator to the application of entangled states to quantum information processing.

An equally important feature of the text is a strong emphasis on experimental methods. Primary photon detection, heterodyne and homodyne techniques, spontaneous down-conversion, and quantum tomography are discussed, together with important experiments. These experimental and theoretical considerations come together in the chapters describing quantum cryptography, quantum communications, and quantum computing.

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量子光學，即個別光子與物質的相互作用，始於普朗克和愛因斯坦的發現，但近年來，它已超越純物理學，成為技術創新的重要推動力。本書從基礎物理的初步描述開始，逐步構建更高級的處理方法，以服務於這一發展所帶來的廣泛讀者群。讀者將從簡單諧振子的量子理論，進一步了解到納入量子信息處理的纏結態的應用。

本書同樣重要的特點是對實驗方法的強調。主要光子檢測、異頻和同頻技術、自發下轉換和量子層析等被討論，並介紹了重要的實驗。這些實驗和理論考慮在描述量子密碼學、量子通信和量子計算的章節中相結合。

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