This chapter provides a general introduction to the basic concepts of quantum optomechanics. It shows how strongly quantum optomechanical systems reduce to a linear interaction between a phonon mode and the mode of the fluctuations of the cavity field. It then presents the effect of light on the response the mechanical system, drawing an analogy with sideband cooling. Homodyne measurement of the position of the mechanical system is described. The chapter ends by explaining how to prepare exotic states of a mechanical oscillator and how the physics of the interaction between light and matter at play in optomechanics may one dayallow investigations of the possible effects of quantum gravity.
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