Generation of spatially broadband twin beams for quantum imaging

TL;DR

This paper demonstrates the generation of spatially broadband, multimode twin beams via 4-wave mixing in hot atomic vapor, enabling high-dimensional quantum imaging with quantum correlations across multiple spatial modes.

Contribution

It introduces a novel method to produce spatially multimode twin beams with finite orbital angular momentum using 4-wave mixing in atomic vapor, expanding quantum imaging capabilities.

Findings

Measured coherence area smaller than the process bandwidth

Generated bright twin images with quantum-correlated sub-areas

Produced twin beams with finite orbital angular momentum

Abstract

We generate spatially multimode twin beams using 4-wave mixing in a hot atomic vapor in a phase-insensitive traveling-wave amplifier configuration. The far-field coherence area measured at 3.5 MHz is shown to be much smaller than the angular bandwidth of the process and bright twin images with independently quantum-correlated sub-areas can be generated with little distortion. The available transverse degrees of freedom form a high-dimensional Hilbert space which we use to produce quantum-correlated twin beams with finite orbital angular momentum.