Method and device for fabricating frequency degenerate multiphoton entanglement source using integrated waveguide

Abstract

The invention discloses a method and device for fabrication of a frequency degenerate multi-photon entangled source using an integrated waveguide. The method comprises the following steps that (1), two pulsed light beams with different frequencies are obtained; (2), intensity of the two pulsed light beams is amplified; (3), relative time delay of the two pulsed light beams is adjusted to synchronize the two pulsed light beams, and the polarization directions of the two pulsed light beams are adjusted to be consistent; and (4), the two pulsed light beams are introduced into a Sagnac loop, eachpulsed light beam is divided into two beams of light orbiting in different directions and generates photon pairs under the spontaneous four-wave mixing of a third-order nonlinear medium, the pulsed light beams returning from different directions are combined and elicited from the Sagnac loop, and the frequency degenerate multi-photon entangled source is obtained. The method has higher stability and expansibility, can achieve complexity which is difficult to achieve in space optics, and has a high application prospect.

Description

technical field [0001] The invention belongs to the field of quantum integrated optics, and proposes a method and device for preparing a frequency-degenerate multi-photon entanglement source by using an integrated waveguide, which can be applied in quantum information processing. Background technique [0002] At present, the multi-photon entangled state preparation technology mostly uses second-order nonlinear crystals such as BBO to realize in space optics. This method requires high experimental conditions, is expensive, and faces difficulties in stability and scalability. Recently, a research group used the third-order nonlinear effect in integrated devices to prepare multi-photon entangled states with non-degenerate frequencies. This technology overcomes the stability and scalability problems of space photonics. However, compared with the frequency degenerate quantum state, the application range of the non-degenerate quantum state is narrow, especially it cannot be applie...

AI Technical Summary

Problems solved by technology

However, compared with the frequency degenerate quantum state, the non-degenerate quantum state has a narrow application range, especially in the field of optical quantum computing that requires multiple identical photon quantum interference

To use the third-order nonlinear effect in integrated devices to prepare degenerate multi-photon quantum states, two pulsed optical pumps are needed, and this technology has not been applied to the preparation of integrated multi-photon entanglement sources

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