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Generation of quantum‐entangled twin photons by waveguide nonlinear‐optic devices
Author(s) -
Suhara T.
Publication year - 2009
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.200810054
Subject(s) - photon , quantum entanglement , photon entanglement , physics , quantum optics , quantum , polarization (electrochemistry) , waveguide , optoelectronics , nonlinear optics , optics , spontaneous parametric down conversion , lithium niobate , quantum information , nonlinear system , quantum information science , quantum mechanics , chemistry
This paper reviews the quasi‐phase‐matched (QPM) waveguide nonlinear‐optic device technologies for generation of quantum‐entangled twin photons indispensable for quantum‐information techniques. After a brief introduction to the concept of entanglement, quantum theory analysis of twin‐photon generation (TPG) is outlined to clarify the properties of twin photons. Then, methods for entangled‐photon generation are discussed. Practical design and theoretical performances of LiNbO 3 waveguide QPM TPG devices, as well as the fabrication techniques, are described. Finally, experimental demonstrations of polarization‐entangled twin‐photon generation by waveguide Type‐I and Type‐II QPM TPG devices are presented.