  We have investigated theoretically the interaction between individual quantum
dot with broken inversion symmetry and electromagnetic field of a single-mode
quantum microcavity. It is shown that in the strong coupling regime the system
demonstrates nonlinear optical properties and can serve as emitter of the
terahertz radiation at Rabi frequency of the system. Analytical results for
simplest physical situations are obtained and numerical quantum approach for
calculating emission spectrum is developed.
