Full quantum state reconstruction of symmetric two-mode squeezed thermal states via spectral homodyne detection

TL;DR

This paper presents a method for full quantum state reconstruction of symmetric two-mode squeezed thermal states using spectral homodyne detection, demonstrated with an optical parametric oscillator and a single homodyne detector.

Contribution

The paper introduces a novel spectral homodyne detection scheme for reconstructing two-mode squeezed thermal states, enabling efficient analysis with active cavity stabilization.

Findings

Successfully reconstructed a range of states from uncorrelated to entangled

Demonstrated the method's effectiveness with an optical parametric oscillator

Validated the approach with experimental data

Abstract

We suggest and demonstrate a scheme to reconstruct the symmetric two-mode squeezed thermal states of spectral sideband modes from an optical parametric oscillator. The method is based on a single homodyne detector and active stabilization of the cavity. The measurement scheme have been successfully tested on different two-mode squeezed thermal states, ranging from uncorrelated coherent states to entangled states.