National Changhua University of Education Institutional Repository : Item 987654321/14336
English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 6498/11670
造訪人次 : 25637773      線上人數 : 71
RC Version 3.2 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜尋範圍 進階搜尋


題名: Temporal and Spatial Dependence of Quantum Entanglement from a Field Theory Perspective
作者: Lin, Shi-Yuun;Hu, B. L.
貢獻者: 物理學系
日期: 2009
上傳時間: 2012-10-25T08:26:30Z
出版者: The American Physical Society
摘要: 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.
關聯: Phys. Rev. D, 79(8): 085020
顯示於類別:[物理學系] 期刊論文


檔案 大小格式瀏覽次數



DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回饋