Heralded hyper-CNOT gates for two-photon systems assisted by quantum scattering in waveguides  

作　　者：Jing-Xue Zhang Xue-Tong Sun Lin-Xiong Wang Hai-Rui Wei Guo-Zhu Song 

机构地区：[1]School of Public Health,Tianjin University of Traditional Chinese Medicine,Tianjin 301617,China [2]College of Physics and Materials Science,Tianjin Normal University,Tianjin 300387,China [3]School of Mathematics and Physics,University of Science and Technology Bejing,Beijing 100083 China

出　　处：《Communications in Theoretical Physics》2024年第11期76-84,共9页理论物理通讯（英文版）

基　　金：supported by the Tianjin Natural Science Foundation under Grant No.23JCQNJC00560;the Natural Science Funds of Tianjin Normal University under Grant No.YJRC202421;the National Natural Science Foundation of China under Grants Nos.12004281 and 62371038;the Scientific Research the Natural Science Basic Research Program of Shaanxi under Grant No.2023-JC-QN-0092;the Program Funded by Education Department of Shaanxi Provincial Government under Grant No.23JK0705。

摘　　要：Photonic hyper-parallel quantum gates play a critical role in high-capacity quantum communication and fast quantum computing.Here,based on photon scattering in onedimensional(1D)waveguides,we present some heralded schemes for constructing four-qubit hyper-controlled-not(hyper-CNOT)gates in two-photon systems.The qubits are encoded on both the polarization and spatial-mode degrees of freedoms(DOFs)of the photons,which can simplify the quantum circuit and reduce the quantum resource consumption.In our schemes,the faulty scattering events between photons and emitters caused by system imperfections can be filtered out and discarded.That is,our protocols for hyper-CNOT gates work in a heralded way.Our calculations show that,with great progress in the emitter-waveguide systems,our photonic hyper-CNOT gates may be experimentally feasible.

关 键 词：quantum computation hyper-CNOT gate waveguide QED 

分 类 号：O431.2[机械工程—光学工程]