@article{HeuerMenzelMilonni2015,
  author    = {Heuer, A. and Menzel, R. and Milonni, P. W.},
  title     = {Induced Coherence, Vacuum Fields, and Complementarity in Biphoton Generation},
  series = {Physical review letters},
  volume    = {114},
  journal   = {Physical review letters},
  number    = {5},
  publisher = {American Physical Society},
  address   = {College Park},
  issn      = {0031-9007},
  doi       = {10.1103/PhysRevLett.114.053601},
  pages     = {5},
  year      = {2015},
  abstract  = {It is well established that spontaneous parametric down-conversion with induced coherence across two coupled interferometers results in high-visibility single-photon interference. We describe experiments in which additional photon channels are introduced such that "which-path" information is made possible and the fringe visibility in single-photon interference is reduced in accordance with basic notions of complementarity. However, these additional pathways result in nearly perfect visibility when photons are counted in coincidence. A simplified theoretical model accounts for these observations and attributes them directly to the vacuum fields at the different crystals.},
  language  = {en}
}