Tailored Photon-Pair Generation in Optical Fibers

OFFIR COHEN, JEFF S. LUNDEEN, BRIAN J. SMITH, GRACIANA PUENTES, PETER J. MOSLEY, AND IAN A. WALMSLEY

PHYSICAL REVIEW LETTERS

AMER PHYSICAL SOC

Lugar: New York; Año: 2009 vol. 102 p. 1 - 4

0031-9007

We experimentally control the spectral structure of photon pairs created via spontaneous four-wave mixing in microstructured fibers. By fabricating fibers with designed dispersion, one can manipulate the photons? wavelengths, joint spectrum, and, thus, entanglement. As an example, we produce photon pairs with no spectral correlations, allowing direct heralding of single photons in pure-state wave packets without filtering. We achieve an experimental purity of ð85:9 􏶹 1:6Þ%, while theoretical analysis and preliminary tests suggest that 94.5% purity is possible with a much longer fiber.