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This paper describes high-performance optical circuits operating on hyper-entangled quantum states. The concept is based on correlated photon pairs generated in such a way that their polarization, frequency or propagation paths are entangled and can be used to support quantum encryption protocols. Detection and processing of such signals requires hyper-spectral optical circuits capable of responding to non-classical features of light. Processing capabilities of these quantum circuits are straight-forward in theory, but physical implementation can still present a challenge for integrity of the quantum states. In this paper, we address experimental verification of entanglement characteristics at each step of building the quantum optical circuits and present a formal quantitative approach based on the quantum state tomography.
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Vladimir V. Nikulin, Rushui Fang, John E. Malowicki, Vijit Bedi, "Application of quantum state tomography to experimental analysis of entanglement in quantum optical circuits," Proc. SPIE 11507, Quantum Communications and Quantum Imaging XVIII, 115070F (26 August 2020); https://doi.org/10.1117/12.2570765