Low-noise macroscopic twin beams

TL;DR

This paper demonstrates a technique to produce low-noise, bright, multi-mode twin beams with suppressed noise and enhanced nonclassical correlations, improving their potential for quantum technology applications.

Contribution

A novel multiphoton-subtraction method to generate low-noise macroscopic twin beams with enhanced quantum correlations from high-gain parametric down conversion.

Findings

Up to 8-fold noise suppression in each beam

Preservation and improvement of photon number correlations

Generation of states with up to 2000 photons per mode

Abstract

Applying a multiphoton-subtraction technique to two-color macroscopic squeezed vacuum state of light generated via high-gain parametric down conversion we conditionally prepare a new state of light: bright multi-mode low-noise twin beams. The obtained results demonstrate up to 8-fold suppression of noise in each beam while preserving and even moderately improving the nonclassical photon number correlations between the beams. The prepared low-noise macroscopic state, containing up to 2000 photons per mode, is not among the states achievable through nonlinear optical processes. The proposed technique substantially improves the usefulness of twin beams for quantum technologies.