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It has been almost four decades since Dan Walls and I commenced the first edition of this book in Hamilton, New Zealand. In that time, quantum optics has spread over a large domain of theory and applications. Quantum computing, little more than a curious footnote to quantum foundations when I started, has grown into a multi billion dollar industry. The parallel fields of quantum communication and quantum sensors are impacting the wealth and security of nations. I have been unable to include recent advances in quantum machine learning in optical technologies for practical reasons. The field is new and changing very fast. I am quite sure that this will figure prominently in a future edition. In four decades, I have accumulated a considerable debt of gratitude to a legion of teachers, collaborators, students and friends in the field of quantum optics, and theoretical physics more broadly, and the list grows steadily. There are far too many to name here. This work would not have been possible without your help.