Polarisation-entangled photon-pair source at 1550 nm using 1 mm-long PPLN waveguide in fibre-loop configuration

2007/11/22 by S. Odate, Satoru Odate, A. Yoshizawa +3
Computer Science · Engineering · Physics and Astronomy · #Coincidence #Lithium niobate #Loop (graph theory) #Materials science #Optics #Optoelectronics #Parametric statistics #Photon #Photonic and Optical Devices #Physics #Quantum #Quantum Information and Cryptography #Quantum entanglement #Quantum mechanics #Quantum optics and atomic interactions #Spontaneous parametric down-conversion #Waveguide #Wavelength

paper · doi:10.1049/el:20071590

openalex publication_date 2007/11/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31

Abstract

A source of polarisation-entangled photons that uses the spontaneous parametric downconversion process in the telecommunication wavelength band is reported. A 1 mm-long periodically poled lithium niobate waveguide was placed in a fibre loop to realise spontaneous parametric downconversion, and it was operated at room temperature. Two-photon interferences having visibilities greater than 84% before subtraction of accidental coincidence counts were observed.

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