najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2019-10-2-147-153najo-629Research ArticlePHYSICSФИЗИКАNumerical modeling of ion exchange waveguide for the tasks of quantum computationsGerasimenkoV.

Kronverkskiy, 49, Saint Petersburg, 197101 

lyagacruz@gmail.comGerasimenkoN.

Kronverkskiy, 49, Saint Petersburg, 197101 

KiselevF.

Kronverkskiy, 49, Saint Petersburg, 197101 

SamsonovE.

Kronverkskiy, 49, Saint Petersburg, 197101 

KozlovS.

Kronverkskiy, 49, Saint Petersburg, 197101 

ITMO UniversityRussian Federation201912082025102147153Copyright © Gerasimenko V., Gerasimenko N., Kiselev F., Samsonov E., Kozlov S., 20252025Gerasimenko V., Gerasimenko N., Kiselev F., Samsonov E., Kozlov S.Gerasimenko V., Gerasimenko N., Kiselev F., Samsonov E., Kozlov S.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/629

This paper is devoted to the simulation of a single-mode ion-exchange waveguide and the 3dB directional coupler for quantum chips. We performed diffusion modeling of Na+ $ K+ ions in the R2O−SnO2−SiO2 glass and optical modeling by the beam propagation method. A wavelength of 1064 nm was used corresponding to the requirements of the single-mode regime for our waveguide. Simulation of diffusion has shown that the profile of the refractive index of overlapping areas can be modeled by summing two separate profiles, which is crucial for optimizing performance. In the process of optical modeling it was possible to minimize losses on s-bends of changing the width of the bend and reducing the interaction length to zero. So we looked at many aspects of device optimization and performed a design, manufacture and characteristics simulation of a directional 3dB coupler. The overall transmittance of proposed device was evaluated as 0.96.

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The authors declare that there are no conflicts of interest present.