We present a scheme for generating polarization-entangled photons pairs with arbitrary joint spectrum. Specifically, we describe a technique for spontaneous parametric down-conversion in which both the center frequencies and the bandwidths of the down-converted photons may be controlled by appropriate manipulation of the pump pulse. The spectral control offered by this technique permits one to choose the operating wavelengths for each photon of a pair based on optimizations of other system parameters (loss in optical fiber, photon counter performance, etc.). The combination of spectral control, polarization control, and lack of group-velocity matching conditions makes this technique particularly well-suited for a distributed quantum information processing architecture in which integrated optical circuits are connected by spans of optical fiber.
@article{arxiv.quant-ph/0405021,
title = {Generating Polarization-Entangled Photon Pairs with Arbitrary Joint Spectrum},
author = {Zachary D. Walton and Alexander V. Sergienko and Bahaa E. A. Saleh and Malvin C. Teich},
journal= {arXiv preprint arXiv:quant-ph/0405021},
year = {2019}
}