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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 24 — Nov. 19, 2012
  • pp: 26868–26877

Efficient single-spatial-mode periodically-poled KTiOPO4 waveguide source for high-dimensional entanglement-based quantum key distribution

Tian Zhong, Franco N. C. Wong, Alessandro Restelli, and Joshua C. Bienfang  »View Author Affiliations


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 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.

© 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 KTiOPO4 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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