A novel integrated quantum circuit for high-order W-state generation and its highly precise characterization  

一种用于高阶W态制备的新颖量子集成线路及其高精度表征（英文）

作　　者：Ren Heilmann Markus Gra¨ fe Stefan Nolte Alexander Szameit 

机构地区：[1]Institute of Applied Physics, Abbe Center of Photonics,Friedrich-Schiller-Universitt Jena, Max-Wien-Platz 1,07743 Jena, Germany

出　　处：《Science Bulletin》2015年第1期96-100,共5页科学通报（英文版）

基　　金：financial support from the German Ministry of Education and Research (Center for Innovation Competence program, Grant No. 03Z1HN31);the Thuringian Ministry for Education, Science and Culture (Research group Spacetime, Grant No. 11027-514);the Deutsche Forschungsgemeinschaft (Grant No. NO462/6-1);the German-Israeli Foundation for Scientific Research and Development (Grant No. 1157-127.14/ 2011)

摘　　要：Multipartite entangled states like the W-class are of growing interest since they exhibit a variety of possible applications ranging from quantum computation to genuine random number generation. Here, we present a universal setup to generate high-order single photon W-states based on three-dimensional integrated-photonic waveguide struc- tures. Additionally, we present a novel method to charac- terize the device＇s unitary by means of classical light only.多粒子纠缠态(如W态)在量子计算、真随机数产生等方面有着广泛的应用空间,因此受到越来越多的关注.其中W态纠缠还具有显著的抗退相干性.本文提出一种用于产生高阶单光子W态的通用实验装置,这种装置基于由激光直写制备的三维集成光子波导结构.此外,由于在量子光学中,通常需要精确表征量子元件的幺正矩阵,本文提出一种新颖的方法,即使用传统的光干涉测量法实现这种表征.对于幺正矩阵元,分别使用强度测量和基于利萨如图形的高灵敏度相位测量获得其模和幅角.在这种方法中,相位测量的复杂程度与通道数量呈线性关系,因而也适用于表征通道更多的量子元件.实验表明,该方法可以高精度地表征W态制备装置中量子门的保真度.

关 键 词：Quantum information - Integrated optics Quantum computing Entangled states 

分 类 号：TN24[电子电信—物理电子学] O413[理学—理论物理]