A hybrid integrated optical communication band on-chip quantum entanglement source

Abstract

The invention relates to a hybrid integrated optical communication band on-chip quantum entanglement source, including a laser generation and amplification module and a nonlinear optical module. The nonlinear optical module is formed by connecting two sections of nonlinear waveguides through a second harmonic filter. Under the action of pump light in the optical communication band, the second harmonic generation and the spontaneous parametric down-conversion process occur successively in the two nonlinear waveguides, thereby realizing the generation of quantum entangled two-photons. The second harmonic filter connecting the two waveguides can effectively suppress the remaining pump light and avoid the noise introduced by the spontaneous Raman scattering process in the entangled two-photon. All the devices required by the on-chip quantum entanglement source are integrated on the same substrate material, effectively reducing the volume of the quantum entanglement source. The hybrid integrated optical communication band on-chip quantum entanglement source proposed by the present invention has the characteristics of high integration, high brightness and low noise at the same time, and can be realized through advanced micro-nano processing and packaging technology, which is conducive to the integration and practicalization of quantum light sources develop.

Description

technical field [0001] The invention belongs to the technical field of quantum detection and quantum network, and in particular relates to a mixed and integrated on-chip quantum entanglement source in the optical communication band. Background technique [0002] Entangled two-photons in the optical communication band are the most important resources in the field of optical quantum detection and optical quantum networks. It has been widely used in optical fiber-based high-precision quantum detection and quantum networks: such as quantum imaging, distributed quantum Teleportation and other programs play an important role. The existing quantum entanglement sources built using optical communication commercial devices are complex in structure and bulky, thus reducing the scalability of quantum communication systems. The preparation of entangled two-photons is generally based on the spontaneous parametric process in the second-order or third-order nonlinear medium. Compared with ...

AI Technical Summary

Problems solved by technology

In order to improve the scalability of the quantum communication system, it is necessary to increase the integration of the quantum entanglement source. Since the second-order nonlinear waveguide has the characteristics of small size and easy integration, fiber coupling is usually used to make the pump light into the second-order nonlinear waveguide. The waveguide generates entangled two-photons in the optical communication band. However, the photons generated by the spontaneous Raman scattering process of the pump light in the fiber will enter the second-order nonlinear waveguide along with the pump light, and the remaining pump light will also follow the entangled double photons. Photons are output from the second-order nonlinear waveguide and enter the entangled two-photon transmission channel. Noise photons are generated through the spontaneous Raman scattering process in the transmission fiber, thereby reducing the purity of the entangled two-photon and seriously affecting the application of the entangled two-photon.

In order to reduce the number of noise photons, the power of the pump light can be reduced, but the brightness of the entangled two-photons is inevitably reduced

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