Open AccessStable source of high quality telecom-band polarization-entangled photon-pairs based on a single, pulse-pumped, short PPLN waveguide
Author(s) -
Han Chuen Lim,
Akio Yoshizawa,
Hidemi Tsuchida,
K. Kikuchi
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.012460
Subject(s) - lithium niobate , optics , quantum entanglement , polarization (electrochemistry) , photon , quantum optics , spontaneous parametric down conversion , photon entanglement , physics , optoelectronics , materials science , quantum , chemistry , quantum mechanics
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.