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18 September 2018 Coherent frequency bridge between visible and telecommunications band for vortex light
Shi-long Liu, Zhi-yuan Zhou, Shi-kai Liu, Yin-hai Li, Shuai Shi, Bao-sen Shi
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Proceedings Volume 10771, Quantum Communications and Quantum Imaging XVI; 107710N (2018) https://doi.org/10.1117/12.2320020
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States
Abstract
In quantum communications, vortex photons can encode higher-dimensional quantum states and build highdimensional communication networks (HDCNs). The interfaces that connect different wavelengths are significant in HDCNs. We construct a coherent orbital angular momentum (OAM) frequency bridge via difference frequency conversion in a nonlinear bulk crystal. Using a single resonant cavity, maximum quantum conversion efficiencies from visible to infrared are 36%, 15%, and 7.8% for topological charges of 0,1, and 2, respectively. The average fidelity obtained using quantum state tomography for the down-converted infrared OAM-state of topological charge 1 is 96.51%. We also prove that the OAM is conserved in this process by measuring visible and infrared interference patterns. This coherent OAM frequency-down conversion bridge represents a basis for an interface between two high-dimensional quantum systems operating with different spectra.
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Shi-long Liu, Zhi-yuan Zhou, Shi-kai Liu, Yin-hai Li, Shuai Shi, and Bao-sen Shi "Coherent frequency bridge between visible and telecommunications band for vortex light", Proc. SPIE 10771, Quantum Communications and Quantum Imaging XVI, 107710N (18 September 2018); https://doi.org/10.1117/12.2320020
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KEYWORDS
Infrared radiation
Visible radiation
Photons
Tomography
Spatial light modulators
Quantum information
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