Entanglement and discord: accelerated observations of local and global modes

TL;DR

This paper studies how entanglement and quantum discord in a two-mode squeezed state change with acceleration, revealing that localized modes behave differently from Unruh modes, especially at high accelerations.

Contribution

It demonstrates that localized modes exhibit qualitatively different correlation degradation under acceleration compared to Unruh modes, highlighting the importance of mode choice in relativistic quantum information.

Findings

Entanglement undergoes sudden death at high accelerations.

Quantum discord approaches zero as acceleration becomes infinite.

Localized modes show different correlation properties than Unruh modes at large accelerations.

Abstract

We investigate the amount of entanglement and quantum discord extractable from a two mode squeezed state as considered from the viewpoint of two observers, Alice (inertial) and Rob (accelerated). We find that using localized modes produces qualitatively different correlation properties for large accelerations than do Unruh modes. Specifically, the entanglement undergoes a sudden death as a function of acceleration and the discord asymptotes to zero in the limit of infinite acceleration. We conclude that the previous Unruh mode analyses do not determine the acceleration dependent entanglement and discord degradation of a given quantum state.