Shulou(Shulou.com)11/24 Report--

Thanks to CTOnews.com netizen xiaocluoyuzi for the clue delivery! CTOnews.com news on January 7, miniaturization and integration is an ideal solution to solve the problems of poor stability and non-scalability of space optical quantum systems, and it is also the only way for optical quantum computing and quantum communication to be large-scale and practical. As an indispensable part of quantum optical system, the miniaturization of quantum light source has always been the focus of people's research.

According to the official news of the University of Science and Technology of China, Professor Ren Xifeng, a team of academicians of the University of Science and Technology of China, in cooperation with Professor Qiu Chengwei and Dr. Guo Qiangbing of the National University of Singapore, made an important breakthrough in the research of two-dimensional material nonlinear quantum light source.

CTOnews.com learned that the results were published in the journal Nature on January 4, DOI 41586-022-05393-7.

According to reports, Ren Xifeng, in cooperation with Nanjing University and other units, introduced superstructured surfaces into the field of quantum information, integrated superstructured lens arrays and nonlinear optical crystals, realized 100 path parameter downconversion, and prepared ultra-high-dimensional quantum entangled states and multiphoton sources.

In order to further improve the degree of integration of the quantum light source, Ren Xifeng, together with the collaborators of the National University of Singapore, realized the ultra-thin quantum light source for the first time by using the nonlinear process of the new two-dimensional material NbOCl2, and the thickness can be as low as 46nm.

This new type of NbOCl2 material not only has the high second-order nonlinear coefficient which is unique to the common monolayer two-dimensional materials, but also has weak interlayer electron coupling and asymmetric spatial structure. Because of this characteristic, the second-order nonlinear signal strength will increase with the increase of the number of layers of two-dimensional materials, which can exceed the WS2 frequency doubling strength of single-layer two-dimensional materials by more than two orders of magnitude.

The researchers have tested the spontaneous parametric down-conversion process of multilayer NbOCl2 two-dimensional materials and proved that the process produces non-classical correlated photon pairs. In addition, they also measured the relationship between the parametric optical signal intensity and the thickness of two-dimensional materials, and the experimental results are in good agreement with the theoretical expectations.

It is worth noting that the material with a thickness as low as 46 nm can also be used as a quantum light source, which is the thinnest nonlinear quantum light source reported in the world. This study not only provides an integrated quantum light source for the study of optical quantum information, but also opens up a new direction for the nonlinear study of two-dimensional materials.

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