Correlation harvesting between particle detectors in uniform motion

TL;DR

This paper studies how particle detectors in various uniform accelerated motions can harvest quantum correlations and entanglement, revealing motion-dependent effects and conditions for genuine entanglement extraction.

Contribution

It analyzes correlation harvesting for detectors in four types of uniform acceleration, including nonstationary effects and the possibility of genuine entanglement in causal contact.

Findings

Detectors in linear, catenary, and cusped motions harvest fewer correlations in nonstationary setups.

Detectors in circular motion show similar correlation harvesting in stationary and nonstationary cases.

Under certain conditions, detectors in linear and circular motions can harvest genuine entanglement despite causal contact.

Abstract

We investigate the correlation harvesting protocol using two Unruh-DeWitt particle detectors moving along four classes of uniformly accelerated trajectories categorized by Letaw: linear, catenary, cusped, and circular motions. For each trajectory, two types of configurations are carried out: one possesses a stationary (time-translation invariant) Wightman function and the other is nonstationary. We find that detectors undergoing linear, catenary, and cusped motions gain fewer correlations in the nonstationary configurations compared to those in stationary configurations. Detectors in circular motion have similar behavior in both configurations. We discuss the relative suppression of correlation harvesting due to high acceleration for each case. Remarkably we find that under certain circumstances detectors in both linear and circular states of motion can harvest genuine (non-communication assisted) entanglement even though they are in causal contact.