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Optical waveguide structure capable of generating intermediate infrared entangled state photon and method thereof

An entangled state and optical waveguide technology, applied in optics, nonlinear optics, instruments, etc., can solve problems such as low conversion efficiency, reduction of nonlinear coupling coefficient, and mutual cancellation of overlapping modes, so as to achieve efficient generation and increase nonlinear coefficient Effect

Active Publication Date: 2018-11-06
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0003] In the related technology, the preparation scheme of the optical quantum entangled state adopts the spontaneous parametric down-conversion in the nonlinear medium, but the conversion efficiency of the parametric down-conversion is low
Multimode phase matching technology is a method to meet the phase matching conditions of three-photon generation, but the pump light needs specific high-order mode driving, so complex mode conversion is required before coupling into the optical waveguide
And in multi-mode phase matching, there is always a mode field with anti-phase distribution in the high-order mode, which is easy to cause the overlapping modes to cancel each other and reduce the nonlinear coupling coefficient

Method used

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  • Optical waveguide structure capable of generating intermediate infrared entangled state photon and method thereof
  • Optical waveguide structure capable of generating intermediate infrared entangled state photon and method thereof
  • Optical waveguide structure capable of generating intermediate infrared entangled state photon and method thereof

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Embodiment Construction

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0025] Please refer to figure 1 , 2 , an embodiment of the present invention provides an optical waveguide structure capable of generating mid-infrared entangled photons, including a strip waveguide 1 and a substrate 2, the strip waveguide 1 is located on the substrate 2, and the strip waveguide The shaped waveguide 1 is made of nonlinear organic material, and the substrate 2 is made of chromium oxide. The material dielectric constant of the chromium oxide has its unique characteristics in the near-infrared to mid-infrared band. In the infrared band, it can be seen that the real part of the dielectric constant of the chromium oxide material becomes a negative value. In the mid-infrared band, the chromium oxide exhibits metallic characteristics and can ...

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Abstract

The invention discloses an optical waveguide structure capable of generating intermediate infrared entangled state photon and a method thereof. Chromic oxide with different dielectric constants is selected as a substrate under different wavelength conditions, a nonlinear organic material serves as a strip waveguide, parameter values of the strip waveguide are determined through effective refractive indexes of different field models formed by the substrate and the strip waveguide under the different wavelength conditions, phase matching is achieved among fundamental modes, a high-order mode andthe conversion among modes are not needed, and the optical waveguide structure is simple; a nonlinear coefficient of a coupling term is effectively improved, and the optical waveguide structure is conductive to effectively generating intermediate infrared entangled three photons.

Description

technical field [0001] The invention relates to the technical field of three-photon generation phase matching in nonlinear optics, in particular to an optical waveguide structure capable of generating mid-infrared entangled photons and a method thereof. Background technique [0002] Entangled photons are more and more applied to many high-tech and basic research fields, such as: absolute calibration of photodetector quantum efficiency, absolute measurement of optical radiation, quantum teleportation, quantum fax, quantum cryptography communication, quantum imaging, Quantum lithography and quantum computing. [0003] In the related art, the preparation scheme of the optical quantum entangled state adopts the spontaneous parametric down-conversion in the nonlinear medium, but the conversion efficiency of the parametric down-conversion is low. Multimode phase matching technology is a method to meet the phase matching conditions of three-photon generation, but the pump light ne...

Claims

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Application Information

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IPC IPC(8): G02F1/35
CPCG02F1/3544
Inventor 黄田野潘建行
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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