Zhong, T.
, Wong, F.
, Restelli, A.
and Bienfang, J.
(2012),
Efficient single-spatial-mode periodically-poled KTiOPO4 waveguide source for high-dimensional entanglement-based quantum key distribution, Optics Express
(Accessed April 19, 2024)
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Efficient single-spatial-mode periodically-poled KTiOPO4 waveguide source for high-dimensional entanglement-based quantum key distribution
Published
Author(s)
Tian Zhong, Franco N. Wong, ,
Abstract
We demonstrate generation of high-purity photon pairs at 1560 nm in a single spatial mode from a periodically-poled KTiOPO4 (PPKTP)waveguide. With nearly-lossless spectral filtering, the PPKTP waveguide source shows approximately 80 % single-mode fiber coupling efficiency and is well suited for high-dimensional time-energy entanglement-based quantum key distribution. Using high count-rate self-differencing InGaAs single-photon avalanche photodiodes configured with either square or sinusoidal gating, we achieve > 1 Mbit/s raw key generation with 3 bits-per-photon encoding, and, to the best of our knowledge, the highest reported Franson quantum-interference visibility of 98.2 % without subtraction of accidental coincidences.Citation
Optics Express
Pub Type
Journals
Keywords
Photon Counting, Nonlinear optics, parametric processes, Quantum detectors, Quantum communications, Quantum information and processing.
Citation
Created November 13, 2012, Updated October 12, 2021