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JOURNALS // Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki // Archive

Pis'ma v Zh. Èksper. Teoret. Fiz., 2024 Volume 119, Issue 12, Pages 942–947 (Mi jetpl7259)

QUANTUM INFORMATION SCIENCE

Reduced characterization of tunable linear photonic integrated circuits

L. V. Biguaaab, K. G. Katamadzeab, B. I. Bantysha, Yu. I. Bogdanova

a Valiev Institute of Physics and Technology, Russian Academy of Sciences, Moscow, 117218 Russia
b Center of Quantum Technologies, Faculty of Physics, Moscow State University, Moscow, 119992 Russia

Abstract: Tunable linear photonic circuits are important elements in both classical and quantum information technologies. The scaling of such circuits is possible only in the integrated form, which complicates their characterization because of the impossibility of the reconstruction of each element individually. The existing methods of characterization of linear photonic circuits require multiple changes in the phases of transfer matrix elements at various values of control parameters, which provides significant experimental difficulties. In this work, a new approach is proposed: it is demonstrated that the measurement of only transmission coefficients for certain values of the control parameters of the photonic circuit allows the development of a mathematical model that can predicts transmission coefficients for arbitrary values of the parameters. This method has been successfully approved in a numerical experiment for a tunable four-channel interferometer implementing an arbitrary unitary transformation. The proposed method provides new possibilities to efficiently characterize and design tunable linear photonic circuits.

Received: 06.02.2024
Revised: 25.04.2024
Accepted: 08.05.2024

DOI: 10.31857/S1234567824120115


 English version:
Journal of Experimental and Theoretical Physics Letters, 2024, 119:12, 966–971


© Steklov Math. Inst. of RAS, 2024