24 October 2016 Polarization entangled cluster state generation in a lithium niobate chip
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We present a design of a quantum information processing C-phase (Controlled-phase) gate applicable for generating cluster states that has a form of integrated photonic circuits assembled with cascaded directional couplers on a Ti in-diffused Lithium Niobate (Ti-LN) platform where directional couplers as the integrated optical analogue of bulk beam splitters are used as fundamental building blocks. Based on experimentally optimized fabrication parameters of Ti-LN optical waveguides operating at an 810nm wavelength, an integrated Ti-LN quantum C-phase gate is designed and simulated. Our proposed C-phase gate consists of three tunable directional couplers cascaded together with having different weighted switching ratios for providing a tool of routing vertically- and horizontally-polarized photons independently. Its operation mechanism relies on selectively controlling the optical coupling of orthogonally polarized modes via the change in the index of refraction, and its operation is confirmed by the BPM simulation.
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Attila Szep, Attila Szep, Richard Kim, Richard Kim, Eunsung Shin, Eunsung Shin, Michael L. Fanto, Michael L. Fanto, Joseph Osman, Joseph Osman, Paul M. Alsing, Paul M. Alsing, } "Polarization entangled cluster state generation in a lithium niobate chip", Proc. SPIE 9996, Quantum Information Science and Technology II, 99960G (24 October 2016); doi: 10.1117/12.2240270; https://doi.org/10.1117/12.2240270


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