# Faithful Entanglement Swapping Based on Sum-Frequency Generation

 Authors: Nicolas Sangouard, Bruno Sanguinetti, Noé Curtz, Nicolas Gisin, Rob Thew, Hugo Zbinden Phys. Rev. Lett. 106, 120403 (2011) http://dx.doi.org/10.1103/PhysRevLett.106.120403 We show that an entanglement swapping operation performed with spontaneous parametric down-conversion can be made faithful without postselection using sum-frequency generation. This invites us to revisit the sum-frequency process and from a proof-of-principle experiment, we demonstrate that it provides a realistic solution for nonlinear optics at the single-photon level. This opens the way to attractive alternatives to six-photon protocols based on linear optics used, e.g., for the heralded creation of maximally entangled pairs or for device-independent quantum key distribution. physrevlett.106.120403.pdf

# BibTeX Source

@Article{Sangouard11,
title =        "Faithful Entanglement Swapping Based on Sum-Frequency Generation",
author =       "Nicolas Sangouard and Bruno Sanguinetti and Noé Curtz and Nicolas Gisin and Rob
Thew and Hugo Zbinden",
journal =      "Phys. Rev. Lett.",
volume =       "106",
number =       "12",
pages =        "120403",
numpages =     "4",
year =         "2011",
month =        mar,
doi =          "10.1103/PhysRevLett.106.120403",
publisher =    "American Physical Society",
abstract =     "We show that an entanglement swapping operation performed with spontaneous
parametric down-conversion can be made faithful without postselection using
sum-frequency generation. This invites us to revisit the sum-frequency process and
from a proof-of-principle experiment, we demonstrate that it provides a realistic
solution for nonlinear optics at the single-photon level. This opens the way to
attractive alternatives to six-photon protocols based on linear optics used, e.g.,
for the heralded creation of maximally entangled pairs or for device-independent
quantum key distribution.",
}