Fluctuation properties of acoustic phonons generated by ultrafast optical excitation of a quantum dot by D. Wigger, D. E. Reiter, V. M. Axt, T. Kuhn.
We study theoretically the fluctuation properties of acoustic phonons created in a semiconductor quantum dot after ultrafast optical excitation. An excitation with single pulse creates an exciton confined to dot, which is coupled longitudinal phonons. This leads formation polaron accompanied by emission phonon wave packet. show that fluctuations lattice displacement associated packet laser resonance transition are always larger than their respective vacuum values. Manipulating second can result reduction below limit, means squeezed. squeezing strongly depend on relative phase and time delay between two pulses.