title: Stable source of high quality telecom-band polarization-entangled photon-pairs based on a single, pulse-pumped, short PPLN waveguide.
abstract: We demonstrate a stable source of high quality telecom-band polarization-entangled photon-pairs based on a single, pulse-pumped, short periodically-poled lithium niobate (PPLN) waveguide. Full quantum state tomographic measurement performed on the photon-pairs has revealed a very high state purity of 0.94, and an entanglement fidelity exceeding 0.96 at the low-rate-regime. At higher rates, entanglement quality degrades due to emission of multiple-pairs. Using a new model, we have confirmed that the observed degradation is largely due to double- and triple-pair emissions.
authors: Graduate School of Engineering, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan. hanchuen@ginjo.k.u-tokyo.ac.jp
authors: Han Chuen
authors: HC
authors: Lim
authors: Akio
authors: A
authors: Yoshizawa
authors: Hidemi
authors: H
authors: Tsuchida
authors: Kazuro
authors: K
authors: Kikuchi
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D008029:Lighting / Q000295:instrumentation*; D009556:Niobium / Q000737:chemistry*; D055095:Optics and Photonics / Q000295:instrumentation*; D010087:Oxides / Q000737:chemistry*; D017785:Photons; D013685:Telecommunications / Q000295:instrumentation*
chemical_list: D010087:Oxides; D009556:Niobium; C091692:lithium niobate