Manifestations of changes in entanglement and onset of synchronization in tomograms

TL;DR

This paper demonstrates that qualitative changes in optical tomograms can reveal nonclassical effects like entanglement dynamics and quantum synchronization, bypassing the need for full quantum state reconstruction in continuous-variable systems.

Contribution

It shows that entanglement changes and synchronization onset are directly observable in optical tomograms, offering a new approach to study quantum dynamics without full state reconstruction.

Findings

Entanglement dynamics are reflected in optical tomograms.

Quantum synchronization onset manifests as qualitative changes in tomograms.

The method bypasses the need for Wigner function reconstruction.

Abstract

Quantum state reconstruction for continuous-variable systems such as the radiation field poses challenges which arise primarily from the large dimensionality of the Hilbert space. Many proposals for state reconstruction exist, ranging from standard reconstruction protocols to applications of machine learning. No universally applicable protocol exists, however, for extracting the Wigner function from the optical tomogram of an arbitrary state of light. We establish that nonclassical effects such as entanglement changes during dynamical evolution and the onset of quantum synchronization are mirrored in qualitative changes in optical tomograms themselves, circumventing the need for state reconstruction for this purpose.