Correlation Harvesting by Unruh--DeWitt Detectors in a Cylindrical Cavity: Entanglement, Mutual Information, and Quantum Discord
Abstract
We study correlations between two Unruh--DeWitt detectors coupled to a massless scalar field confined inside a cylindrical cavity through entanglement negativity, mutual information and quantum discord measures. The entanglement negativity follows the free space behavior for small energy gaps and small separation, while it gets enhanced for large energy gap as the off-axis detector reach cavity boundary. The entanglement island, where negativity is nonzero, gets extended for large energy gaps as compared to free space and the detectors can get entangled for large separations when one of them is placed near cavity boundary. In contrast, quantum mutual information and quantum discord remain nonzero over a substantially broader parameter range, including regions in which the negativity has vanished. However, these correlations are suppressed inside the cavity as compared to the free space correlations. Therefore, boundary conditions can selectively reshape the structure of harvested correlations in quantum field theory.
Related
- Symmetry-driven correlation patterns in one-dimensional periodic fermionic systems: closed-form expressions and exact selection rules for correlation functions, entanglement entropies and mutual information
- Entanglement surfaces for rotating cylindrical black holes
- A General Master Equation for Two Accelerated Detectors: Stationary States and Entanglement
- Do gravitational waves assist the genuine tripartite entanglement harvesting?
- Spectral Localization in Cavity-Mediated Entanglement Harvesting
BibTeX
@misc{kaushal2026correlation,
title = {{Correlation Harvesting by Unruh--DeWitt Detectors in a Cylindrical Cavity: Entanglement, Mutual Information, and Quantum Discord}},
author = {Shagun Kaushal and Harkirat Singh Sahota},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2605.28055},
eprint = {2605.28055},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.28055},
}
RIS
TY - UNPB
TI - Correlation Harvesting by Unruh--DeWitt Detectors in a Cylindrical Cavity: Entanglement, Mutual Information, and Quantum Discord
AU - Shagun Kaushal
AU - Harkirat Singh Sahota
PY - 2026
DA - 2026/10/23
PB - arXiv
DO - 10.48550/arxiv.2605.28055
UR - https://arxiv.org/abs/2605.28055
AB - We study correlations between two Unruh--DeWitt detectors coupled to a massless scalar field confined inside a cylindrical cavity through entanglement negativity, mutual information and quantum discord measures. The entanglement negativity follows the free space behavior for small energy gaps and small separation, while it gets enhanced for large energy gap as the off-axis detector reach cavity boundary. The entanglement island, where negativity is nonzero, gets extended for large energy gaps as compared to free space and the detectors can get entangled for large separations when one of them is placed near cavity boundary. In contrast, quantum mutual information and quantum discord remain nonzero over a substantially broader parameter range, including regions in which the negativity has vanished. However, these correlations are suppressed inside the cavity as compared to the free space correlations. Therefore, boundary conditions can selectively reshape the structure of harvested correlations in quantum field theory.
ER -