  Electron states in a quantum dot (QD) located near a 2D system of dipolar
excitons are perturbed by fluctuations of the exciton density caused by the
electron-exciton interaction. This results in the frequency changes of electron
transitions in a QD. The frequency depends on the exciton density, as well as
on the exciton gas phase state. In the present work, the shifts of the two
lowest QD energy levels are found both in the normal state of the exciton
system and for the Bose-Einstein condensation (BEC) regime.
