量子电子学报2018，Vol.35Issue(1)：42-48,7.DOI:10.3969/j.issn.1007-5461.2018.01.007
自旋-玻色系统中纠缠态的量子Fisher信息量演化
Quantum Fisher information evolution of entangled states in spin-Boson system
摘要
Abstract
Effects of Bose field environment with an Ohmic spectrum on estimation accuracy of the quantum parameters are investigated based on the typical spin-Boson model.Evolution results of quantum Fisher information of N independent atom systems are obtained by using the two order time-dependent quantum master equation and super operator method.Calculation results show that as the number of entangled atoms increases,the quantum Fisher information increases,and the attenuation of quantum Fisher information is also greatly accelerated.Better measurement accuracy than the standard quantum limit can be obtained in some characteristic period.In the super-Ohmic Bosonic environment with a larger spectral power exponent,the attenuation of Fisher information of quantum entangled state can be suppressed to a certain extent.关键词
量子光学/自旋-玻色模型/含时量子主方程/量子Fisher信息量/量子纠缠态Key words
quantum optics/spin-Boson model/time-dependent quantum master equation/quantum Fisher information/quantum entanglement state分类
数理科学引用本文复制引用
严凯,谢燕青,黄雨梦,郝翔..自旋-玻色系统中纠缠态的量子Fisher信息量演化[J].量子电子学报,2018,35(1):42-48,7.基金项目
Supported by Innovation Project of Graduate Education of Jiangsu Province(江苏省研究生培养创新工程项目,JGLX15-150),Research and Innovation Project of Graduate,Suzhou University of Science and Technology(苏州科技大学研究生科研创新项目,SKYCX16-015) （江苏省研究生培养创新工程项目,JGLX15-150）
