Excess-noise suppression for a squeezed state propagating through random amplifying media via wave-front shaping
Dong Li, Song Sun, Yao Yao
After propagating through a random amplifying medium, a squeezed state commonly shows excess noise above the shot-noise level. Since large noise can significantly reduce the signal-to-noise ratio, it is detrimental for precision measurement. To circumvent this problem, we propose a noise-reduction scheme using wave-front shaping. It is demonstrated that the average output quantum noise can be effectively suppressed even beyond the shot-noise limit. Both the decrease of amplification strength and the increase of input squeezing strength can give rise to a decrease in the suppressed average quantum noise. Our results not only show the feasibility of manipulating the output quantum noise of random amplifying media but also indicate potential applications in quantum information processing in complex environments, such as quantum imaging, quantum communication, and quantum key distribution.
arXiv:2102.02464•Physical Review A•Feb 16, 2021•3 citations