Entanglement Harvesting and Divergences in Unruh-DeWitt Detector Pairs

Quantum Field Theory;Unruh-DeWitt Detector;Quantum Information;Relativistic Quantum Information

Sachs, Allisonadvisor:Mann, Robert ; affiliation1:Faculty of Science ; advisor:Martín-Martínez, Eduardo ; Martín-Martínez, Eduardo ; Mann, Robert ;

University of Waterloo

关键词: Quantum Information;    Master Thesis;    Unruh-DeWitt Detector;    Quantum Field Theory;    Relativistic Quantum Information;   

Others  :  https://uwspace.uwaterloo.ca/bitstream/10012/12237/5/Sachs_Allison.pdf

瑞士|英语

来源: UWSPACE Waterloo Institutional Repository

【 摘 要 】

We analyzecorrelations betweenpairs of detectors quadratically coupledto realand complex scalar bosonic fields in 3+1 dimensions.This is a first step toward studying the entanglementstructure of the fermionic vacuum through the entanglementharvesting protocol.We find that, while a single quadratically coupled Unruh-DeWitt presents no divergences,when one considers pairs of detectors there emerge persistent divergences (not regularizable via smooth switching or smearing) in the entanglement they acquirefrom the field.These divergences were not anticipated in previous studies.We characterize the divergences, discuss whether a suitable regularization can allow for fair comparison of the entanglement harvesting ability of the quadratic and the linear couplings, and finally find a UV-safe quantifier of harvested correlations.