Entanglement activation from quantum coherence and superposition

作     者：Lu-Feng Qiao Alexander Streltsov Jun Gao Swapan Rana Ruo-Jing Ren Zhi-Qiang Jiao Cheng-Qiu Hu Xiao-Yun Xu Ci-Yu Wang Hao Tang Ai-Lin Yang Zhi-Hao Ma Maciej Lewenstein Xian-Min Jin 

作者机构：State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Natural Sciences & Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China Faculty of Applied Physics and Mathematics Gdańsk University of Technology 80-233 Gdańsk Poland National Quantum Information Centre in Gdańsk 81-824 Sopot Poland ICFO–Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology Av. Carl Friedrich Gauss 3 08860 Castelldefels (Barcelona) Spain School of Mathematical Sciences Shanghai Jiao Tong University Shanghai 200240 China ICREA Pg. Lluís Companys 23 08010 Barcelona Spain 

出 版 物：《Physical Review A》 (Phys. Rev. A)

年 卷 期：2018年第98卷第5期

页      面：052351-052351页

核心收录：

基　　金：Narodowe Centrum Nauki, NCN Generalitat de Catalunya Thousand Young Talents Program of China European Commission, EC European Social Fund, ESF Fundación Cellex European Research Council, ERC Horizon 2020 Horizon 2020 Framework Programme, H2020, (641122, 665778) Horizon 2020 Framework Programme, H2020 Shanghai Municipal Education Commission, (2017-01-07-00-02-E00049, 16SG09) Shanghai Municipal Education Commission Agència de Gestió d'Ajuts Universitaris i de Recerca, AGAUR, (2017 SGR 1341) Agència de Gestió d'Ajuts Universitaris i de Recerca, AGAUR National Science Center in Poland, (POLONEZ UMO-2016/21/P/ST2/04054) Seventh Framework Programme, FP7, (339106) Seventh Framework Programme, FP7 National Key Research and Development Program of China, NKRDPC, (2017YFA0303700) National Key Research and Development Program of China, NKRDPC Science and Technology Commission of Shanghai Municipality, STCSM, (16JC1400405, 17JC1400403, 15QA1402200) Science and Technology Commission of Shanghai Municipality, STCSM National Natural Science Foundation of China, NSFC, (11761141014, 61734005, 11690033) National Natural Science Foundation of China, NSFC Ministerio de Economía y Competitividad, MINECO, (SEV-2015-0522, FIS2016-79508-P) Ministerio de Economía y Competitividad, MINECO Poland-Symfonia, (2016/20/W/ST4/00314) 

主　　题：Quantum coherence & coherence measures Quantum communication Quantum computation Quantum correlations in quantum information Quantum entanglement Resource theories 

摘      要：Quantum entanglement and coherence are two fundamental features of nature, arising from the superposition principle of quantum mechanics. While considered as puzzling phenomena in the early days of quantum theory, it is only very recently that entanglement and coherence have been recognized as resources for the emerging quantum technologies, including quantum metrology, quantum communication, and quantum computing. In this work we study the limitations for the interconversion between coherence and entanglement. We prove a fundamental no-go theorem, stating that a general resource theory of superposition does not allow for entanglement activation. By constructing a quantum controlled-not gate as a free operation, we experimentally show that such activation is possible within the more constrained framework of quantum coherence. By using recent results from coherence theory, we further show that the trace norm entanglement is not a strong entanglement monotone.