National Changhua University of Education Institutional Repository : Item 987654321/14336

English | 正體中文 | 简体中文 | Items with full text/Total items : 6507/11669
Visitors : 30055100 Online Users : 662

RC Version 3.2 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.

Scope Adv. Search

Login ‧ Upload ‧ Help ‧ About ‧ Administer

NCUEIR > College of Science > Department of Physics > Periodical Articles > Item 987654321/14336

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/14336

Title:	Temporal and Spatial Dependence of Quantum Entanglement from a Field Theory Perspective
Authors:	Lin, Shi-Yuun;Hu, B. L.
Contributors:	物理學系
Date:	2009
Issue Date:	2012-10-25T08:26:30Z
Publisher:	The American Physical Society
Abstract:	We consider the entanglement dynamics between two Unruh-DeWitt detectors at rest separated at a distance d. This simple model when analyzed properly in quantum field theory shows many interesting facets and helps to dispel some misunderstandings of entanglement dynamics. We find that there is spatial dependence of quantum entanglement in the stable regime due to the phase difference of vacuum fluctuations the two detectors experience, together with the interference of the mutual influences from the backreaction of one detector on the other. When two initially entangled detectors are still outside each other’s light cone, the entanglement oscillates in time with an amplitude dependent on spatial separation d. When the two detectors begin to have causal contact, an interference pattern of the relative degree of entanglement (compared to those at spatial infinity) develops a parametric dependence on d. The detectors separated at those d with a stronger relative degree of entanglement enjoy longer disentanglement times. In the cases with weak coupling and large separation, the detectors always disentangle at late times. For sufficiently small d, the two detectors can have residual entanglement even if they initially were in a separable state, while for d a little larger, there could be transient entanglement created by mutual influences. However, we see no evidence of entanglement creation outside the light cone for initially separable states.
Relation:	Phys. Rev. D, 79(8): 085020
Appears in Collections:	[Department of Physics] Periodical Articles

Files in This Item:

File	Size	Format
index.html	0Kb	HTML	671	View/Open

Loading...