Journal
OPTICS EXPRESS
Volume 25, Issue 20, Pages 24290-24298Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.024290
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Funding
- National Natural Science Foundation of China (NSFC) [11174271, 11604322, 61275115, 61435011, 61525504, 61605194]
- China Postdoctoral Science Foundation [2016M590570]
- Fundamental Research Funds for the Central Universities
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In quantum communications, vortex photons can encode higher-dimensional quantum states and build high-dimensional 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 for HDCNs. 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. (C) 2017 Optical Society of America
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