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Transfer matrix of simple optical elements for applications in quantum photonics
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Perustieteiden korkeakoulu |
Bachelor's thesis
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SCI3103
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en
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27+11
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Abstract
Photonic integrated circuits are an attractive platform for quantum processing due to inherent interferometric stability and scalability. The goal of the thesis is to characterize the performance of photonic integrated circuits in the infrared range using the transfer matrix formalism. Two methods, classical and non-classical, were developed and compared for reconstructing the transfer matrix of linear optical devices. The classical method uses a coherent light source and classical interference. The non-classical method utilizes a biphoton source and single-photon detection for observing Hong-Ou-Mandel interference.
The experimental setups for both methods are described in the thesis, and results are analyzed to highlight the advantages and limitations of each approach. Sinkhorn-Knopp algorithm was implemented for the classical method to extract the information about the waveguide coupling losses. The findings suggest that while the classical method is simpler and provides additional loss matrices, the quantum method offers more precise phase information. Future work includes scaling these methods to larger multiport devices and improving experimental setups for better accuracy.