PPLN waveguide for quantum communication

Authors:S Tanzilli, W Tittel, H De Riedmatten, H Zbinden, P Baldi, M De Micheli, D B Ostrowsky, N Gisin
Journal:European Physical Journal D 18, 155–160 (2002)
DOI:http://dx.doi.org/10.1140/epjd/e20020019
Abstract:We report on energy-time and time-bin entangled photon-pair sources based on a periodically poled lithium niobate (PPLN) waveguide. Degenerate twin photons at 1314 nm wavelength are created by spontaneous parametric down-conversion and coupled into standard telecom fibers. Our PPLN waveguide features a very high conversion efficiency of about 10(-6), roughly 4 orders of magnitude more than that obtained employing bulk crystals [1]. Even if using low power laser diodes, this engenders a significant probability for creating two pairs at a time - all important advantage for some quantum communication protocols. We point out a simple means to characterize the pair creation probability in case of a pulsed pump. To investigate the quality of the entangled states, we perform photon-pair interference experiments, leading to visibilities of 97% for the case of energy-time entanglement and of 84% for the case of time-bin entanglement. Although the last figure must still be improved, these tests demonstrate the high potential of PPLN waveguide based sources to become a key element for future quantum communication schemes.
File:ppln.pdf

BibTeX Source

@ARTICLE{Tanzilli2002,
  author = {Tanzilli, S. and Tittel, W. and De Riedmatten, H. and Zbinden, H.
	and Baldi, P. and De Micheli, M. and Ostrowsky, D. B. and Gisin,
	N.},
  title = {PPLN waveguide for quantum communication},
  journal = {European Physical Journal D},
  year = {2002},
  volume = {18},
  pages = {155--160},
  number = {2},
  abstract = {We report on energy-time and time-bin entangled photon-pair sources
	based on a periodically poled lithium niobate (PPLN) waveguide. Degenerate
	twin photons at 1314 nm wavelength are created by spontaneous parametric
	down-conversion and coupled into standard telecom fibers. Our PPLN
	waveguide features a very high conversion efficiency of about 10(-6),
	roughly 4 orders of magnitude more than that obtained employing bulk
	crystals [1]. Even if using low power laser diodes, this engenders
	a significant probability for creating two pairs at a time - all
	important advantage for some quantum communication protocols. We
	point out a simple means to characterize the pair creation probability
	in case of a pulsed pump. To investigate the quality of the entangled
	states, we perform photon-pair interference experiments, leading
	to visibilities of 97% for the case of energy-time entanglement and
	of 84% for the case of time-bin entanglement. Although the last figure
	must still be improved, these tests demonstrate the high potential
	of PPLN waveguide based sources to become a key element for future
	quantum communication schemes. },
  cl = {INST ETUDES SCI, CARGESE, FRANCE},
  ct = {Conference on Quantum Interference and Cryptographic Keys - NovelEOLEOLPhysics
	and Advancing Technologies (QUICK)},
  cy = {APR 07-13, 2001},
  doi = {10.1140/epjd/e20020019},
  owner = {cc},
  sn = {1434-6060},
  timestamp = {2010.08.20},
  ut = {WOS:000174180500004}
}