Affiliation:
1. Wuhan Institute of Physics and Mathematics
2. University of Chinese Academy of Sciences
3. Wuhan Institute of Quantum Technology
Abstract
We investigate high harmonic generation (HHG) of an atom in the presence of squeezed vacuum of a single harmonic mode. Based on a fully quantum time-dependent Schrödinger equation, we derive an analytical formula for the harmonic amplitude. Our simulations of the HHG spectrum with this formula show that the harmonic amplitude of the corresponding squeezed mode can undergo significant changes with different parameters of the squeezed vacuum. Using the time-frequency analysis method, the physics underlying the effects of the vacuum quantum fluctuation (VQF) on the harmonic generation is revealed, which is found to be consistent with the explanation of Fermi's golden rule. Our work establishes a profound connection between harmonic generation and VQF, and may provide an unconventional approach to manipulating harmonic emission.
Published by the American Physical Society
2024
Funder
National Natural Science Foundation of China
Chinese Academy of Sciences
National Key Program for S&T Research and Development
Publisher
American Physical Society (APS)