I give a tutorial talk about applications of quantum trajectory theory, particularly in quantum optics. I briefly review the development of quantum input-ouput theory in quantum optics and the impact of experiments on trapped ions for thinking about quantum states conditioned on continuous measurement results. I conclude with some speculative comments about the range of applicability of quantum trajectory and input-output theory. This theory is usually derived using quite restrictive approximations but seems likely to be applicable to a wide range of physical systems.
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