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Fabrication limits of waveguides in nonlinear crystals and their impact on quantum optics applications
Waveguides in nonlinear materials are a key component for photon pair sources and offer promising solutions to interface quantum memories through frequency conversion. To bring these technologies closer to every-day life, it is still necessary to guarantee a reliable and efficient fabrication of the...
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Published in: | New journal of physics 2019-03, Vol.21 (3), p.33038 |
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creator | Santandrea, Matteo Stefszky, Michael Ansari, Vahid Silberhorn, Christine |
description | Waveguides in nonlinear materials are a key component for photon pair sources and offer promising solutions to interface quantum memories through frequency conversion. To bring these technologies closer to every-day life, it is still necessary to guarantee a reliable and efficient fabrication of these devices. Therefore, a thorough understanding of the technological limitations of nonlinear waveguiding devices is paramount. In this paper, we study the link between fabrication errors of waveguides in nonlinear crystals and the final performance of such devices. In particular, we first derive a mathematical expression to qualitatively assess the technological limitations of any nonlinear waveguide. We apply this tool to study the impact of fabrication imperfections on the phasematching properties of different quantum processes realized in titanium-diffused lithium niobate waveguides. Finally, we analyse the effect of waveguide imperfections on quantum state generation and manipulation for few selected cases. Studying the impact of fabrication errors on the waveguide widths, we find that the presence of correlated noise plays a major role in the degradation of the phasematching and we suggest different possible strategies to reduce the impact of fabrication imperfections. |
doi_str_mv | 10.1088/1367-2630/aaff13 |
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subjects | Defects fabrication imperfections frequency encoding integrated quantum optics nonlinear optics parametric downconversion Physics Quantum optics squeezing Titanium Titanium diffused lithium niobate Waveguides |
title | Fabrication limits of waveguides in nonlinear crystals and their impact on quantum optics applications |
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