title: Experimental Demonstration of a Hybrid-Quantum-Emitter Producing Individual Entangled Photon Pairs in the Telecom Band.
abstract: Quantum emitters generating individual entangled photon pairs (IEPP) have significant fundamental advantages over schemes that suffer from multiple photon emission, or schemes that require post-selection techniques or the use of photon-number discriminating detectors. Quantum dots embedded within nanowires (QD-NWs) represent one of the most promising candidate for quantum emitters that provide a high collection efficiency of photons. However, a quantum emitter that generates IEPP in the telecom band is still an issue demanding a prompt solution. Here, we demonstrate in principle that IEPPs in the telecom band can be created by combining a single QD-NW and a nonlinear crystal waveguide. The QD-NW system serves as the single photon source, and the emitted visible single photons are split into IEPPs at approximately 1.55 μm through the process of spontaneous parametric down conversion (SPDC) in a periodically poled lithium niobate (PPLN) waveguide. The compatibility of the QD-PPLN interface is the determinant factor in constructing this novel hybrid-quantum-emitter (HQE). Benefiting from the desirable optical properties of QD-NWs and the extremely high nonlinear conversion efficiency of PPLN waveguides, we successfully generate IEPPs in the telecom band with the polarization degree of freedom. The entanglement of the generated photon pairs is confirmed by the entanglement witness. Our experiment paves the way to producing HQEs inheriting the advantages of multiple systems.
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, Anhui 230026, China.|Synergetic Innovation Center of Quantum Information &Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Geng
authors.initials: G
authors.lastname: Chen
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, Anhui 230026, China.|Synergetic Innovation Center of Quantum Information &Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zou
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, Anhui 230026, China.|Synergetic Innovation Center of Quantum Information &Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Wen-Hao
authors.initials: WH
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, Anhui 230026, China.|Synergetic Innovation Center of Quantum Information &Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Zi-Huai
authors.initials: ZH
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, Anhui 230026, China.|Synergetic Innovation Center of Quantum Information &Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Zong-Quan
authors.initials: ZQ
authors.lastname: Zhou
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, Anhui 230026, China.|Synergetic Innovation Center of Quantum Information &Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: De-Yong
authors.initials: DY
authors.lastname: He
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, Anhui 230026, China.|Synergetic Innovation Center of Quantum Information &Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Jian-Shun
authors.initials: JS
authors.lastname: Tang
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, Anhui 230026, China.|Synergetic Innovation Center of Quantum Information &Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Bi-Heng
authors.initials: BH
authors.lastname: Liu
authors.affiliation: Synergetic Innovation Center of Quantum Information &Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.|The state key laboratory for superlattices and microstructures, Institute of semiconductors, CAS, PO Box 912, Beijing 100083, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Synergetic Innovation Center of Quantum Information &Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.|The state key laboratory for superlattices and microstructures, Institute of semiconductors, CAS, PO Box 912, Beijing 100083, China.
authors.forename: Guo-Wei
authors.initials: GW
authors.lastname: Zha
authors.affiliation: Synergetic Innovation Center of Quantum Information &Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.|The state key laboratory for superlattices and microstructures, Institute of semiconductors, CAS, PO Box 912, Beijing 100083, China.
authors.forename: Hai-Qiao
authors.initials: HQ
authors.lastname: Ni
authors.affiliation: Synergetic Innovation Center of Quantum Information &Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.|The state key laboratory for superlattices and microstructures, Institute of semiconductors, CAS, PO Box 912, Beijing 100083, China.
authors.forename: Zhi-Chuan
authors.initials: ZC
authors.lastname: Niu
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, Anhui 230026, China.|Synergetic Innovation Center of Quantum Information &Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Yong-Jian
authors.initials: YJ
authors.lastname: Han
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, Anhui 230026, China.|Synergetic Innovation Center of Quantum Information &Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Chuan-Feng
authors.initials: CF
authors.lastname: Li
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, Anhui 230026, China.|Synergetic Innovation Center of Quantum Information &Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Guang-Can
authors.initials: GC
authors.lastname: Guo