Reconstruction of the Reduced Transfer Matrix for Tunable Linear-Optical Circuits

Biguaa, L.V.; Kondratyev, I.B.; Skryabin, N.N.; Dyakonov, I.V.; Kulik, S.P.

Авторы: Biguaa L.V., Kondratyev I.B., Skryabin N.N., Dyakonov I.V., Kulik S.P.
Журнал: Laser Physics Letters
Том: 22
Год издания: 2025
Издательство: Wiley - VCH Verlag GmbH & CO. KGaA
Местоположение издательства: Germany
Первая страница: 045208
Номер статьи: 045208
DOI: 10.1088/1612-202X/adc552
Аннотация: Tunable linear-optical interferometers are a key element in the implementation of both classicaland quantum information technologies. At the same time, during the production process, thesesystems are subject to various instrumental imperfections and it is necessary to be able todetermine with what accuracy and what transformations the manufactured device is capable toreproduce. For integrated devices, such tasks are difficult to perform due to the difficulties inobtaining direct access to individual optical elements of the circuit. Existing methods forreconstructing the transfer matrix of tunable linear-optical interferometers require measuring thephases of its matrix elements at different values of control signals in the circuit, which is also anexperimentally time-consuming task. However, in some cases, it is possible to construct amathematical model of the circuit that works for any values of its control signals, measuringonly partial amplitude transmission coefficients at the outputs of the circuit, which significantlysimplifies reconstruction and is relevant in a number of applications. In this paper, weperformed numerical and experimental approbation of the method on the example of alinear-optical interferometer with four inputs and four outputs with a universal architecturebased on mixing layers. The average fidelity value of the reconstruction of the reduced transfermatrix of the optical interferometer, taking into account realistic noise in the experiment, was99.9% and can be improved due to the proven stability of the model to them.
Добавил в систему: Кулик Сергей Павлович

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