# Modulating quantum fluctuations of scattered lights in disordered media via wavefront shaping

## TL;DR

This paper demonstrates that wavefront shaping can effectively suppress quantum noise in scattered light within disordered media, enabling quantum fluctuations to be reduced below the shot-noise level, with potential quantum information applications.

## Contribution

It introduces wavefront shaping as a method to reduce quantum noise in scattered modes, a novel approach for controlling quantum fluctuations in disordered media.

## Key findings

- Wavefront shaping reduces quantum noise via destructive interference.
- Quantum fluctuations can be suppressed below shot-noise level.
- Potential applications in quantum imaging and information processing.

## Abstract

After multiple scattering of quadrature-squeezed lights in a disordered medium, the quadrature amplitudes of the scattered modes present an excess noise above the shot-noise level [Opt. Expr. 14, 6919 (2006)]. A natural question is raised whether there exists a method of suppressing the quadrature fluctuation of the output mode. The answer is affirmative. In this work, we prove that wavefront shaping is a promising method to reduce the quantum noise of quadrature amplitudes of the scattered modes. This reduction is owing to the destructive interference of quantum noise. Specifically, when the single-mode squeezed states are considered as inputs, the quantum fluctuation can always be reduced, even below the shot-noise level. These results may have potential applications in quantum information processing, for instance, sub-wavelength imaging using the scattering superlens with squeezed-state sources.