Topologically protecting squeezed light on a photonic chip

作     者：Ruo-Jing Ren Yong-Heng Lu Ze-Kun Jiang Jun Gao Wen-Hao Zhou Yao Wang Zhi-Qiang Jiao Xiao-Wei Wang Alexander S.Solntsev Xian-Min Jin RUO-JING REN;YONG-HENG LU;ZE-KUN JIANG;JUN GAO;WEN-HAO ZHOU;YAO WANG;ZHI-QIANG JIAO;XIAO-WEI WANG;ALEXANDER S.SOLNTSEV;XIAN-MIN JIN

作者机构：Center for Integrated Quantum Information Technologies(IQIT)School of Physics and Astronomy and State Key Laboratory of Advanced Optical Communication Systems and NetworksShanghai Jiao Tong UniversityShanghai 200240China CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026China School of Mathematical and Physical SciencesUniversity of Technology SydneyUltimoNew South Wales 2007Australia TuringQ Co.Ltd.Shanghai 200240China 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2022年第10卷第2期

页      面：456-464页

核心收录：

学科分类：08[工学] 0803[工学-光学工程] 

基　　金：National Key R&D Program of China(2019YFA0308700, 2019YFA0706302, 2017YFA0303700) National Natural Science Foundation of China (NSFC)(11904229, 61734005, 11761141014, 11690033) Science and Technology Commission of Shanghai Municipality (STCSM)(20JC1416300, 2019SHZDZX01) Shanghai Municipal Education Commission (SMEC)(2017-01-07-00-02-E00049) China Postdoctoral Science Foundation (2020M671091) Australian Research Council (DE180100070) University of Technology Sydney Seed Fund 

主　　题：topological squeezed quantum 

摘      要：Squeezed light is a critical resource in quantum sensing and information processing. Due to the inherently weak optical nonlinearity and limited interaction volume, considerable pump power is typically needed to obtain efficient interactions to generate squeezed light in bulk crystals. Integrated photonics offers an elegant way to increase the nonlinearity by confining light strictly inside the waveguide. For the construction of large-scale quantum systems performing many-photon operations, it is essential to integrate various functional modules on a chip. However, fabrication imperfections and transmission cross talk may add unwanted diffraction and coupling to other photonic elements, reducing the quality of squeezing. Here, by introducing the topological phase, we experimentally demonstrate the topologically protected nonlinear process of four-wave mixing, enabling the generation of squeezed light on a silica chip. We measure the cross-correlations at different evolution distances for various topological sites and verify the nonclassical features with high fidelity. The squeezing parameters are measured to certify the protection of cavity-free, strongly squeezed states. The demonstration of topological protection for squeezed light on a chip brings new opportunities for quantum integrated photonics,opening novel approaches for the design of advanced multi-photon circuits.