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Japanese Journal of Applied Physics

Wavelength Tuning by Temperature Control in MgO-Doped LiNbO3Waveguide Quasi-Phase-Matching Twin Photon Generation Device

Shigenobu Kakuno, M. Fujimura, Toshiaki Suhara

Published Feb 15, 2012• 1 citation
Publisher

Abstract

Waveguide quasi-phase-matching (QPM) twin photon generation (TPG) devices are the key device for future quantum communication. We examined the temperature dependences of the twin photon wavelengths of a MgO:LiNbO3waveguide Type-I QPM TPG device to clarify the possibility of twin photon wavelength tuning. It turned out that, in a typical device of 19 µm QPM grating period for TPG in the 1.55 µm band, twin photon wavelength tuning ranges of ≃16 and 300 nm can be obtained for degenerate and nondegenerate TPG, respectively, with temperature control in 25–150 °C.

DOI
10.1143/jjap.51.030201

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Waveguide quasi-phase-matching (QPM) twin photon generation (TPG) devices are the key device for future quantum communication. We examined the temperature dependences of the twin photon wavelengths of a MgO:LiNbO3waveguide Type-I QPM TPG device to clarify the possibility of twin photon wavelength tuning. It turned out that, in a typical device of 19 µm QPM grating period for TPG in the 1.55 µm band, twin photon wavelength tuning ranges of ≃16 and 300 nm can be obtained for degenerate and nondegenerate TPG, respectively, with temperature control in 25–150 °C.
Quantum-entangled twin photons are expected to play an important role in future quantum communications and information processing. We propose and demonstrate a Type-I quasi-phase-matched (QPM) nonlinear-optic (NLO) LiNbO3waveguide device for high-efficiency polarization-entangled twin photon generation. The device consists of a Ti:LiNbO3channel waveguide, a ferroelectric domain-inverted grating for Type-I QPM, and a thin-film half-wave plate for polarization conversion at the center of the NLO interaction region. Generation of polarization-entangled twin-photons is demonstrated through quantum interference experiment.
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Abstract 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 LiNbO3 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.