Cosmological Expansion Induces Interference Between Communication and Entanglement Harvesting

Abstract

We investigate the interplay between genuine entanglement harvesting and communication mediated correlations for local particle detectors in expanding cosmological spacetimes. Focusing on a conformally coupled scalar field in de Sitter spacetime, we analyze how spacetime expansion induces interference between these two sources of entanglement when the detectors are in causal contact. We compare two physically distinct detector models: detectors whose spatial profile expands with the Universe, and detectors whose proper size remains fixed despite cosmological expansion. We find that the lack of time-reversal symmetry in cosmological settings generically leads to constructive or destructive interference between communication mediated correlations and harvested field correlations, dramatically affecting the entanglement that detectors can acquire. In particular, rapid expansion can suppress entanglement entirely for expanding detectors through destructive interference, even when both communication and field correlations are individually large, whereas detectors that maintain a fixed proper size remain capable of acquiring significant entanglement. Our results show that cosmological expansion qualitatively reshapes the balance between communication and harvesting, and that the detector internal cohesion (whether it expands with the Universe or not) plays a crucial role in determining whether detectors' entanglement can survive in rapidly expanding universes.

14 pages, 7 figures, 1 appendix

References in corpus (21)

• A computable measure of entanglement
• Entanglement from the vacuum
• Entangling Power of an Expanding Universe
• Harvesting correlations from the quantum vacuum
• How often does the Unruh-DeWitt detector click? Regularisation by a spatial profile
• Entanglement harvesting from the electromagnetic vacuum with hydrogenlike atoms
• Considerations on the Unruh Effect: Causality and Regularization
• Harvesting Entanglement from the Black Hole Vacuum
• Cosmological quantum entanglement
• Causality issues of particle detector models in QFT and Quantum Optics
• Entanglement in curved spacetimes and cosmology
• General Relativistic Quantum Optics: Finite-size particle detector models in curved spacetimes
• Entangling detectors in anti-de Sitter space
• Harvesting Entanglement with Detectors Freely Falling into a Black Hole
• Broken covariance of particle detector models in relativistic quantum information
• Timelike information broadcasting in cosmology
• Harvesting entanglement from the gravitational vacuum
• Lensing of Vacuum Entanglement near Schwarzschild Black Holes
• Pure State Entanglement Harvesting in Quantum Field Theory
• Universal role of curvature in vacuum entanglement
• Interference of communication and field correlations in entanglement harvesting