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Here we introduce two works on quantum plasmonics: high-visibility on-chip quantum interference of single surface plasmons and transmission of quantum polarization entanglement in a nanoscale hybrid plasmonic waveguide. Our works can bridge nanophotonics and quantum optics.
The joint spectra of the two type-II phase-matchings that add coherently to give rise to the generation of polarization-entangled photon pairs in a poled fiber are measured. Optimal parameters are identified for the generation of high-quality entanglement.
We experimentally demonstrate quantum key distribution at 28 bit/s rate in a telecommunications fiber channel with 45 dB loss using a subcarrier wave approach. This approach offers polarization independency, high bitrates and wide multiplexing capabilities.
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