Generating entangled photon pairs in a parallel crystal geometry

Abstract

We present recent findings towards developing brighter entangled photon sources in critically phase matched (CPM) nonlinear crystals. Specifically, we use type-I collinear phase matching at non-degenerate wavelengths in parallel \b{eta}-Barium Borate (BBO) crystals to generate pairs of polarization entangled photons for free-space quantum key distribution (QKD). We first review the entangled source configuration and then discuss ways to further improve the source brightness by means of tailoring the pump and collection modes. We present preliminary results that may lead to brighter entangled photon sources that are intrinsically robust to changes in their environment.

arXiv comment7 pages, 5 figures

References in corpus (7)

• Quantum entanglement
• Quantum Communication
• Ultra-bright source of polarization-entangled photons
• Phase-stable source of polarization-entangled photons using a polarization Sagnac interferometer
• Collinear source of polarization-entangled photon pairs at non-degenerate wavelengths
• Phase-stable source of polarization-entangled photons in a linear double-pass configuration
• Accurate relative-phase and time-delay maps all over the emission cone of hyperentangled photon source