Real-time signal processing and feedback control are key aspects of classical engineering. As we progress into a new era of quantum engineering, it stands to reason that improved understandings of quantum continuous measurement and real-time feedback could provide similarly empowering methodology. Quantum optics is in many ways an ideal physical setting in which to begin to explore such topics, as there is excellent contact between experiment and ab initio theoretical modeling. What is needed now are case studies in applying the central ideas of real-time filtering and feedback control to problems of practical technological and/or scientific interest, and compelling demonstrations of the novel capabilities such an approach can bring.
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