Boundary duals of bulk detectors
Abstract
What is the boundary dual of an Unruh-DeWitt detector in anti-de Sitter space? We argue that this question is naturally answered by the HKLL reconstruction program. A local detector in the bulk can be associated with a smeared detector in the boundary, where the choice of smearing depends on the choice of HKLL kernel. We use this formalism to analyze entanglement harvesting in the Poincaré patch of AdS3 for a bulk Unruh-DeWitt detector paired either with a boundary detector or with a second bulk detector. We compute the amount of harvesting in the standard way, namely by evaluating the two-detector density matrix to quadratic order in the coupling λ. Additionally, we address an apparent tension between microcausality for spacelike-separated bulk detectors and the fact that the dual HKLL detectors may directly overlap in the boundary theory.
Related
- Boundary-induced three-dimensional one-way bulk transport in gyromagnetic systems
- Bulk Boundary Condition for Semi-Infinite Surfaces in Density Functional Theory
- Boundary Quantum Knizhnik-Zamolodchikov Equations and Integrability of Quantum Field Theories with Time-Dependent Bulk and Boundary Coupling Strengths
- Bulk-Boundary Correspondence in Semi-Infinite Chains from Sublattice Zeros
- Interaction-Enabled Bulk-Boundary Correspondence without a Global Band Gap
BibTeX
@misc{caminiti2026boundary,
title = {{Boundary duals of bulk detectors}},
author = {Jacqueline Caminiti and Robert C. Myers and Kelly Wurtz},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.16109},
eprint = {2609.16109},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.16109},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Boundary duals of bulk detectors
AU - Jacqueline Caminiti
AU - Robert C. Myers
AU - Kelly Wurtz
PY - 2026
DA - 2026/09/23
PB - arXiv
DO - 10.48550/arxiv.2609.16109
UR - https://arxiv.org/abs/2609.16109
AB - What is the boundary dual of an Unruh-DeWitt detector in anti-de Sitter space? We argue that this question is naturally answered by the HKLL reconstruction program. A local detector in the bulk can be associated with a smeared detector in the boundary, where the choice of smearing depends on the choice of HKLL kernel. We use this formalism to analyze entanglement harvesting in the Poincaré patch of AdS_3 for a bulk Unruh-DeWitt detector paired either with a boundary detector or with a second bulk detector. We compute the amount of harvesting in the standard way, namely by evaluating the two-detector density matrix to quadratic order in the coupling λ. Additionally, we address an apparent tension between microcausality for spacelike-separated bulk detectors and the fact that the dual HKLL detectors may directly overlap in the boundary theory.
ER -