Tailored photon-pair generation in optical fibers

Abstract

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 $85.9\pm 1.6$, while theoretical analysis and preliminary tests suggest 94.5% purity is possible with a much longer fiber.

References in corpus (3)

• Silica-on-Silicon Waveguide Quantum Circuits
• Photon pair-state preparation with tailored spectral properties by spontaneous four-wave mixing in photonic-crystal fiber
• Nonclassical 2-photon interference with separate intrinsically narrowband fibre sources