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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, Alessandro Restelli, Joshua Bienfang

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

Keywords

Photon Counting, Nonlinear optics, parametric processes, Quantum detectors, Quantum communications, Quantum information and processing.

Citation

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 August 15, 2022)
Created November 13, 2012, Updated October 12, 2021