Cryogenic Electro-Optic Polarisation Conversion in Titanium in-diffused Lithium Niobate Waveguides

Abstract

Many technologies in quantum photonics require cryogenic conditions to operate. However, the underlying platform behind active components such as switches, modulators and phase shifters must be compatible with these operating conditions. To address this, we demonstrate an electro-optic polarisation converter for 1550nm light at 0.8K in titanium in-diffused lithium niobate waveguides. To do so, we exploit the electro-optic properties of lithium niobate to convert between orthogonal polarisation modes with a fiber-to-fiber transmission >43%. We achieve a modulation depth of 23.6 +/-3.3dB and a conversion voltage-length product of 28.8 V cm. This enables the combination of cryogenic photonics and active components on a single integration platform.

arXiv comment6 pages, 4 figures

References in corpus (5)

• Integrated Photonic Quantum Technologies
• Detecting Single Infrared Photons with 93% System Efficiency
• Efficient, Compact and Low Loss Thermo-Optic Phase Shifter in Silicon
• Toolbox for the design of $LiNb{O}_3$-based passive and active integrated quantum circuits
• Integrated transition edge sensors on lithium niobate waveguides

Cited by in corpus (6)

• Single-photon detection and cryogenic reconfigurability in Lithium Niobate nanophotonic circuits
• Cryogenic electro-optic interconnect for superconducting devices
• Cryogenic second harmonic generation in periodically-poled lithium niobate waveguides
• Cryogenic and hermetically sealed packaging of photonic chips for optomechanics
• Quasi-edge states and topological Bloch oscillation in the synthetic space
• Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides