Efficient single-spatial-mode periodically-poled KTiOPO_{4} waveguide source for high-dimensional entanglement-based quantum key distribution |
Optics Express, Vol. 20, Issue 24, pp. 26868-26877 (2012)
http://dx.doi.org/10.1364/OE.20.026868
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Abstract
We demonstrate generation of high-purity photon pairs at 1560 nm in a single spatial mode from a periodically-poled KTiOPO_{4} (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.
© 2012 OSA
OCIS Codes
(030.5260) Coherence and statistical optics : Photon counting
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(270.5570) Quantum optics : Quantum detectors
(270.5565) Quantum optics : Quantum communications
(270.5585) Quantum optics : Quantum information and processing
ToC Category:
Quantum Optics
History
Original Manuscript: October 3, 2012
Revised Manuscript: November 5, 2012
Manuscript Accepted: November 5, 2012
Published: November 14, 2012
Citation
Tian Zhong, Franco N. C. Wong, Alessandro Restelli, and Joshua C. Bienfang, "Efficient single-spatial-mode periodically-poled KTiOPO_{4} waveguide source for high-dimensional entanglement-based quantum key distribution," Opt. Express 20, 26868-26877 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-24-26868
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