物理学报2016，Vol.65Issue(10)：100301-1-100301-7,7.DOI:10.7498/aps.65.100301
等距离耦合腔系统中的非局域性∗
Dynamics of nonlo cality in the three equidistance cavities coupled by fib ers
摘要
Abstract
Entanglement and nonlocality, two most striking features of quantum mechanics, are fundamental resources for quantum information processing. They play an important role in quantum information processing. Therefore, studying the dynamics of quantum nonlocality and entanglement is of importance for both fundamental research and practical applications. In this paper we consider the case that three identical two-level atoms are trapped respectively in the three separated equidistance single-mode cavities, which are placed at the vertices of an equilateral triangle and are coupled by three fibers. Each atom resonantly interacts with cavity via a one-photon hopping. The evolution of the state vector of the system is given by solving the schrodinger equation when the total excitation number of the system equals one. The dynamics of nonlocality in the system is investigated via Mermin-Ardehali-Belinksii-Klyshko (MABK) inequality. By the numerical calculations, the MABK inequality is studied when the initial state vector of three atoms is W state or the initial state vector of three cavities is also W state. The influence of cavity-fiber coupling constant on the MABK inequality is discussed. The evolution curves of the MABK parameters Ba and Bc are plotted. The curves show that Ba and Bc both display periodic oscillations, and their oscillation frequencies all increase with the increase of cavity-fiber coupling constant. Ba and Bc are both larger than 1 when the scaling time gt takes a certain value. The results show that the quantum state of three atoms or that of three cavities displays nonlocality. On the other hand, the nonlocality of three-atom quantum state is strengthened with the increase of cavity-fiber coupling constant.关键词
量子光学/耦合腔/非局域性/Mermin-Ardehali-Belinksii-Klyshko不等式违背Key words
quantum optics/coupled cavities/nonlocality/violation of Mermin-Ardehali-Belinksii-Klyshko’s inequality引用本文复制引用
卢道明..等距离耦合腔系统中的非局域性∗[J].物理学报,2016,65(10):100301-1-100301-7,7.基金项目
福建省自然科学基金(批准号:2015J01020)资助的课题 （批准号:2015J01020）
