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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Bibliographic Details
Published in:New journal of physics 2019-03, Vol.21 (3), p.33038
Main Authors: Santandrea, Matteo, Stefszky, Michael, Ansari, Vahid, Silberhorn, Christine
Format: Article
Language:English
Subjects:
Defects
fabrication imperfections
frequency encoding
integrated quantum optics
nonlinear optics
parametric downconversion
Physics
Quantum optics
squeezing
Titanium
Titanium diffused lithium niobate
Waveguides
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Summary: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.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/aaff13