Non-Gaussian quantum states generation and robust quantum non-Gaussianity via squeezing field  

作　　者：唐绪兵 高放 王耀雄 匡森 双丰 

机构地区：[1]School of Mathematics & Physics Science and Engineering,Anhui University of Technology [2]Institute of Intelligent Machines,Chinese Academy of Sciences [3]Department of Automation,University of Science & Technology of China

出　　处：《Chinese Physics B》2015年第3期194-201,共8页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.61203061 and 61074052);the Outstanding Young Talent Foundation of Anhui Province,China(Grant No.2012SQRL040);the Natural Science Foundation of Anhui Province,China(Grant No.KJ2012Z035)

摘　　要：Recent studies show that quantum non-Gaussian states or using non-Gaussian operations can improve entanglement distillation, quantum swapping, teleportation, and cloning. In this work, employing a strategy of non-Gaussian operations（namely subtracting and adding a single photon）, we propose a scheme to generate non-Gaussian quantum states named single-photon-added and-subtracted coherent（SPASC） superposition states by implementing Bell measurements, and then investigate the corresponding nonclassical features. By squeezed the input field, we demonstrate that robustness of nonGaussianity can be improved. Controllable phase space distribution offers the possibility to approximately generate a displaced coherent superposition states（DCSS）. The fidelity can reach up to F ≥ 0.98 and F ≥ 0.90 for size of amplitude z = 1.53 and 2.36, respectively.Recent studies show that quantum non-Gaussian states or using non-Gaussian operations can improve entanglement distillation, quantum swapping, teleportation, and cloning. In this work, employing a strategy of non-Gaussian operations（namely subtracting and adding a single photon）, we propose a scheme to generate non-Gaussian quantum states named single-photon-added and-subtracted coherent（SPASC） superposition states by implementing Bell measurements, and then investigate the corresponding nonclassical features. By squeezed the input field, we demonstrate that robustness of nonGaussianity can be improved. Controllable phase space distribution offers the possibility to approximately generate a displaced coherent superposition states（DCSS）. The fidelity can reach up to F ≥ 0.98 and F ≥ 0.90 for size of amplitude z = 1.53 and 2.36, respectively.

关 键 词：non-Gaussian operation Bell measurements ROBUSTNESS FIDELITY 

分 类 号：O413.1[理学—理论物理]