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This lecture covers the Stern-Gerlach experiment, where two spin states are considered and different forces are applied using a magnetic field gradient. Strong projective measurements and the dispersive limit in cavity quantum electrodynamics are discussed, along with the Lamb shift and measurement of a qubit in the cavity. The lecture also delves into dephasing from atom-photon interaction and the implications of the standard quantum limit. Various topics such as quantum noise, linearization, phase-number uncertainty, measurement rate, and spectral densities are explored in the context of quantum optomechanics.