Multi-petahertz electron interference in Cr:AlO solid-state material.

Lightwave-field-induced ultrafast electric dipole oscillation is promising for realizing petahertz (10 Hz: PHz) signal processing in the future. In building the ultrahigh-clock-rate logic operation system, one of the major challenges will be petahertz electron manipulation accompanied with multiple frequencies. Here we study multi-petahertz interference with electronic dipole oscillations in alumina with chromium dopant (Cr:AlO).